MAINTENANCE MANUAL BO 105 92 ELECTRICAL SYSTEMS Table of Contents Paragraph Title Page 92 -- 1 GENERAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 92 -- 2 Common electrical components of the electrical systems . . . . . . . . . . . . . . . . . . . . . . . . . 9 92 -- 3 Removal and installation -- common electrical components . . . . . . . . . . . . . . . . . . . . . . . . 9 92 -- 4 Inspection -- common electrical components . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 92 -- 5 Main relay box 1VE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 92 -- 6 Relay box 10VE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 92 -- 7 DC POWER SYSTEM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23 92 -- 8 Component location -- DC power system . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25 92 -- 9 DC power system controls . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31 92 -- 10 Generator operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41 92 -- 11 Operation -- battery power . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48 92 -- 12 Operation -- external power . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48 92 -- 13 Power distribution . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49 92 -- 14 Protection of DC power system circuits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53 92 -- 15 Troubleshooting -- DC power system . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55 92 -- 16 MAINTENANCE -- DC POWER SYSTEM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60 92 -- 17 Check and adjustment of generator voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60 92 -- 18 Generator system . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62 92 -- 19 Starter--generators . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65 92 -- 20 Removal and installation -- starter--generators . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67 92 -- 20A Inspection and maintenance -- starter--generators . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 69 92 -- 21 Voltage regulators . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70 CHAPTER 92 Page 1 MAINTENANCE MANUAL BO 105 Paragraph Title Page 92 -- 22 Removal and installation -- voltage regulators . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 71 92 -- 23 Inspection and maintenance -- voltage regulators . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 72 92 -- 24 Functional test -- generator system . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 72 92 -- 25 Battery power system . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 75 92 -- 26 Battery . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 76 92 -- 27 Removal and installation -- battery . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 76 92 -- 28 Inspection and Maintenance -- battery . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 77 92 -- 29 Functional test -- battery power system . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 79 92 -- 30 External power system . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 81 92 -- 31 External power receptacle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 83 92 -- 32 Inspection and maintenance -- external power receptacle . . . . . . . . . . . . . . . . . . . . . . . . . 83 92 -- 33 Functional test -- external power system . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 83 92 -- 33A Removal and installation -- EPU annunciator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 84 92 -- 34 Monitoring DC power system . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 85 92 -- 34A Voltmeter and ammeter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 85 92 -- 34B Generator failure warning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 87 92 -- 34C External power engagement warning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 87 92 -- 34D Generator overheat warning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 88 92 -- 34E Battery temperature warning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 88 92 -- 35 Battery temperature switches . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 89 92 -- 36 Removal and installation -- battery temperature switches . . . . . . . . . . . . . . . . . . . . . . . . . 90 92 -- 37 Inspection and maintenance -- battery temperature switches . . . . . . . . . . . . . . . . . . . . . . 90 92 -- 38 Functional test -- DC power system monitoring equipment . . . . . . . . . . . . . . . . . . . . . . . . 90 92 -- 39 STARTER AND IGNITION SYSTEM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 91 92 -- 40 Locations -- starter and ignition system . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 92 92 -- 41 Protection of circuits of starter and ignition system . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 97 92 -- 42 Troubleshooting -- Starter and Ignition System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 97 92 -- 43 Inspection -- starter and ignition system . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 100 CHAPTER 92 Page 2 Revision 27 MBB HELICOPTERS MAINTENANCE MANUAL MBB .B0 105 Paragraph Page Title . . . . . . . . . . . . . . . . 101 F u n c t i o n a l test .s t a r t e r system . . . . . . . . . . . . . 105 I g n i t i o n s y s t e m . . . . . . . . . . . . . . 107 F u n c t i o n a l test .i g n i t i o n system . . . . . . . . . . . . . 108 . . . . . . . . . . . 109 ENGINE AND MAIN TRANSMISSION SYSTEMS Locations .engine and main t r a n s m i s s i o n systems . . . . . 110 P r o t e c t i o n of engine and main t r a n s m i s s i o n systems . . . . 112 . . . . . . . . . . . . 118 M o n i t o r i n g s y s t e m s RPM monitoring .engines and r o t o r . . . . . . . . . . . . 118 RPM warning N I and NR . . . . . . . . . . . . . . . . . . . 119 N2 overspeed warning . . . . . . . . . . . . . . . . . . . 121 Troubleshooting .RPM monitoring, e n g i n e s and r o t o r . . . . 122 F u n c t i o n a l t e s t .RPM monitoring, e n g i n e s and r o t o r . . . . 124 . . . . . . . . . . . . . . . . . . . 126 Chipdetectorsystem O i l p r e s s u r e monitoring . . . . . . . . . . . . . . . . . . 127 . . . . . . . . . . . . . . . . . . 133 Temperaturemonitoring N 2 G o v e r n o r . . . . . . . . . . . . . . . . . . . . 134 Troubleshooting .N2 governor . . . . . . . . . . . . . . . . 139 F u n c t i o n a l t e s t .N 2 governor . . . . . . . . . . . . . . . 141 E n g i n e a n t i - i c i n g s y s t e m . . . . . . . 142 Troubleshooting .engine a n t i - i c i n g system . . . . . . . . 146 F u n c t i o n a l test .engine a n t i - i c i n g system . . . . . . . . 146 S t a r t e r s y s t e m . . . 147 Troubleshooting .engine f i r e d e t e c t i o n System . . . . . . . 151 E n g i n e f i r e d e t e c t i o n s y s t e m B0 105 CHAPTER 92 Page 3 MAINTENANCE MANUAL B 0 105 Paragraph Title Page Functional test . engine fire detection system ................................... Removal and installation. engine fire detection system .......................... Oil cooler fan failure waming system ....................................... ........................... Functional test . oil cooler fan failure warning system ............................ Removal and installation. oil cooler fan failure waming system ................... Troubleshooting. oil cooler fan failure warning system FUEL SYSTEM ............................................................. ..................................................... Protection of circuits of fuel system ............................................ Locations . fuel system Fuel supply system ........................................................ Troubleshooting. fuel supply system .......................................... Functional test . fuel supply system Fuel shutoff system ........................................... ........................................................ .......................................... Functional test . fuel shutoff system ........................................... Leakage test . fuel shutoff system ............................................. Troubleshooting. fuel shutoff system Monitoring . fuel supply system ............................................ .................................................... Differentialfuel pressure (BYPASS) waming system ............................. Low fuel warning system CONTROL SYSTEMS ....................................................... Locations . control systems .................................................. Protection of circuits of control systems ........................................ CHAPTER 92 Page 4 Revision 21 MAINTENANCE MANUAL B 0 105 Paragraph Title 92 . 90 Hydraulic system Page .......................................................... 1i7 Hydraulic pressure monitoring system .......................................... Electrically initiated system switch-over . hydraulic system ....................... Cyclic stick trim ........................................................... Troubleshooting. cyclic stick trim ............................................. Functional test . cyclic stick trim .............................................. Cyclic stick grip ........................................................... Removal and installation . cyclic stick grip ...................................... Removal and installation . four-way beeper switch 2CC .......................... Removal and installation . P T button 14RT ..................................... Removal and installation . push button switch .................................. Control unit on collective pitch stick ........................................ Removal and installation . components of control unit on collective pitch stick ....... Removal and installation . four-way switch (8KA) and switches 11MF, 20LA. 24LA and 2MD ......................................... Removal and installation . switch 13MF ........................................ LlGHTlNG SYSTEMS ....................................................... 92 . 106 Locations . lighting systems .................................................. 205 92 . 107 Protection of lighting systems ................................................. 206 92 . 108 Position light system ...................................................... 92 . 109 Troubleshooting. position lights .............................................. 207 92 . 110 lnspection and maintenance . position lights .................................... 208 92 . 111 Removal and installation . position lights ....................................... 211 92 . 112 Removal and Installation . tail light ............................................ 212 Revision 22 207 CHAPTER 92 Page 5 MBB HELICOPTERS MAINTENANCE MANUAL MBB .B0 105 Paragraph Title 92 .113 92 .116 . . . . . . . . . . 215 A n t i - c o l l i s i o n l i g h t s y s t e m . . . . 215 Troubleshooting .anti-collision light system . . . . . . . 219 Inspection for condition .anti-collision lights 4LA, 5LA . . 220 92 .117 Removal and installation .anti-collision light system 92 .118 Removal and installation .anti-collision light 4LA . . . . . 221 92-114 92 .115 Page Functional test .position light system . 221 Removal and installation .anti-collision light 5LA . . . . . 222 . . . . . . . 224 Functional test .anti-collision lighting . . . . . . . . . 224 I n t e r n a 1 l i g h t i n g s y s t e m . . . . . . . . 225 Troubleshooting .internal lighting . . . . . . . . . . . . . 228 Inspection and maintenance .internal lighting . . . . . . 229 Removal and installation .internal lighting . . . . . . . . 229 Functional test .internal lighting . . . . . . . . . . . . 230 I n s t r u m e n t l i g h t i n g . . . . . . . . . . . 231 Troubleshooting .instrument lighting . . . . . . . . . . . 235 Removal and installation .eyebrow lights and post lights . . 235 Removal and installation .light control unit 9LC . . . . . 236 Removal and installation .potentiometer lOLC . . . . . . . 237 Functional test .instrument lighting . . . . . . . . . . . 238 W a r n i n g l i g h t s e g m e n t s . . . . . . . . . 238 Removal and installation .flasher unit 21LA 92 .130 92 .131 92 .132 92-133 B 0 105 CHAPTER 92 Page 6 MBB HELICOPTERS MAINTENANCE MANUAL MBB Paragraph Title 92-133A MISCELLANEOUS SYSTEMS 92-134 - 135 92 - 136 92 92-137 92-138 - B 0 105 Page ELECTRICAL . . . . . . . . . . . . . . . . . . . . . . . 241 P i t o t t u b e h e a t i n g . . . . . . . . . . . . . 241 Troubleshooting - p i t o t tube heating . . . . . . . . . . . . 242 Functional t e s t - p i t o t tube heating . . . . . . . . . . . 242 O v e r h e a d p a n e l 12VE . . . . . . :. . . . 243 C e n t e r p a n e l . . . . . . . . . . . . . . . . . . . . 247 B 0 105 CHAPTER 92 Page 7 / 8 MAINTENANCE MANUAL BO 105 92 -- 1 GENERAL The electrical systems of the helicopter BO 105 are: -- DC power system -- Starter and ignition system -- Engine and main transmission systems -- Fuel system -- Control systems -- Lighting system -- Miscellaneous electrical systems Troubleshoot in conjunction with the Wiring Diagram Manual (WDM) With post SB BO105--90--102 fuses can be replaced by circuit breakers. 4A and 6,3A fuses be replaced by 5A circuit breakers, if they are connected with AWG22 wire. 6,3A fuses be replaced by 7,5A circuit breakers, if they are connected with AWG10 to AWG20 wires. NOTE 92 -- 2 Common electrical components of the electrical systems The common electrical components are installed in the following equipment as shown in figures 92LEERER MERKER to 92--2: -- Main relay box 1VE (see figures 92--4 thru 92--6) -- Instrument panel 2VE (see chapter 91) -- Relay box 10VE (see paragraph 92--6) -- Overhead panel 12VE (see chapter 92--137) -- Center panel (see paragraph 92--138) -- External power receptacle 2P (see paragraph 92--31) 92 -- 3 Removal and installation -- common electrical components NOTE Perform maintenance with proper tools, using antimagnetic ones if necessary. Blank off plugs with protective caps. Insulate wire ends with electrical tape and inspect solder connections for integrity. 1. Removal a. Pull all circuit breakers and set all switches to OFF. b. Remove battery connector 1P and secure against inadvertent reconnection. Revision 26 CHAPTER 92 Page 9 MAINTENANCE MANUAL BO 105 c. Remove attaching hardware. d. If necessary, identify wiring to aid reconnection. e. Remove component. 2. Installation a. Install new component using attaching hardware. b. Connect wiring or electrical connectors (safety as necessary). 92 -- 4 Inspection -- common electrical components 1. Inspect electrical wiring for correct routeing, security, damage, and evidence of overheating or burns. -- repair, reroute or secure wiring. 2. Inspect electrical terminals for corrosion, looseness and damage. -- remove corrosion, tighten or replace terminals. 3. Inspect all bonding jumpers for condition. -- repair or replace. 4. Disconnect plugs and inspect contact pins for condition. Visually inspect shrink sleeves for porosity. -- replace corroded or damaged pins, replace shrink sleeve or plug. 5. Visually inspect shock mounts for damage. -- replace shock mounts. 6. Inspect parts for security, damage, corrosion and burns. -- tighten or replace parts, remove corrosion. CHAPTER 92 Page 10 BO105_WAH_1483_R MAINTENANCE MANUAL BO 105 1 4 3 EFFECTIVITY 5 Series A, C, D S/N 7 -- 160 3 4 2 1 5 1 2 2 1 2 2 1 Engine Starter generator Main Relay Box 1VE Voltage regulator Voltage regulator Power supply relay Reverse--current relay Generator relay Generator relay Shunt Circuit breaker Fuse / circuit breaker 1 1 3 1 Fuse / circuit breaker Generator control-relay Diode Starter bus Instrument Panel 2VE Battery External power receptacle External power relay Battery relay Auxiliary bus relay EFFECTIVITY 1 1 103P, 203P 2 104P, 204P 108P, 208P 8P 105P, 205P 109P, 209P 107P, 207P 110P, 210P 21P, 22P 128P, 228P 33P, 34P 35P, 36P, 29P 39P 1 1 106P, 206P 112P, 212P, 111P, 211P PP1 1 1 1P 4 1 2P 7P 6P 10P D series only 5 2 Emergency bus relais Battery switch Generator control switch Generator control switch Voltmeter Ammeter Generator failure warning light Emerg. DC Bus pushbutton indicator Ammeter selector switch EPU ON indicator light Shunt Auxiliary relay Fuse / circuit breaker Fuse / circuit breaker Main bus Auxiliary bus Emergency bus Overhead Panel 12VE Generator field cutout switch Relay Box 10VE EFFECTIVITY 40P 16P 117P, 217P 118P, 218P 18P 19P 23P 41P 24P 27P 20P 26P 11P, 25P 30P, 32P, 13P, 38P PP21 PP22 PP20 104P, 204P A and C series only Figure 92--1 Electrical equipment location Revision 26 CHAPTER 92 Page 11 MAINTENANCE MANUAL BO 105 1 3 EFFECTIVITY Series A, C, S/N 161 and subsequent 1 2 4 BO105_WAH_1484_R 3 1 Engine Starter generator Main Relay Box 1VE Voltage regulator Reverse--current relay Power supply relay Generator relay Shunt Circuit breaker Fuse / circuit breaker 2 1 3 103P, 203P 104P, 204P 105P, 205P 8P 109P, 209P 21P, 22P 128P, 228P 33P, 34P, 35P 29P, 36P, 37P Generator control relay 106P, 206P Starter bus PP1 1 EFFECTIVITY Optional emergency bus 1 1 1 1 4 Instrument Panel 2VE Battery 1P External power receptacle 2P Battery relay 6P External relay 7P Battery master switch 16P Starter--generator control switch 117P, 217P Voltmeter 18P Ammeter 19P Generator warning light 23P Ammeter selector switch 24P EPU ON indicator light 27P Shunt 20P Fuse / circuit breaker 11P, 25P, 30P 31P, 32P Fuse / circuit breaker 13P ENERG. DC BUS pushbutton indicator 15P Auxiliary bus relay 10P Main bus PP21 Auxiliary bus PP22 Emergency bus PP20 Emergency bus relay 14P Relay Box 10VE Figure 92--2 Electrical equipment location CHAPTER 92 Page 12 Revision 26 MAINTENANCE MANUAL BO 105 4 3 5 2 1 4 BO105_WAH_1485_R EFFECTIVITY Series S 1 1 2 3 Engine Starter generator Main Relay Box 1VE Voltage regulator Reverse--current relay Power supply relay Generator relay Shunt Circuit breaker Fuse / circuit breaker Battery master switch Starter--generator control switch Voltmeter Ammeter Generator warning light Ammeter selector switch EPU ON indicator light Shunt Fuse / circuit breaker 103P, 203P Generator control relay Starter bus Instrument Panel 2VE External power receptacle External power relay Auxiliary bus relay 104P, 204P 105P, 205P 8P 109P, 209P 21P, 22P 128P, 228P 33P, 34P 35P, 36P 106P, 206P PP1 2P 7P 10P 4 5 Main bus Auxiliary bus Starter relay Engine Deck (aft right) Battery Battery relay Strip fuse Relay Box 10VE 16P 117P, 217P 18P 19P 23P 24P 27P 20P 30P, 31P, 32P 25P, 26P PP21 PP22 103J, 203J 1P 6P 5P Figure 92--3 Electrical equipment location Revision 26 CHAPTER 92 Page 13 MAINTENANCE MANUAL BO 105 92 -- 5 Main relay box 1VE The main relay box 1VE is installed in the aft RH side of the cargo compartment (see figures 92--1 to 92--3). The following components of the main relay box are accessible after removal of the cover. -- voltage regulator 104P, 204P, 108P and 208P -- generator relays 107P, 109P, 207P, 209P, 110P and 210P -- generator control relay 106P, 206P -- reverse--current relay 105P, 205P -- power supply relay 8P -- circuit breaker 128P, 228P -- junction box 1VV -- diodes 111P, 112P, 211P, 212P -- shunts 21P, 22P, 129P -- fuses or circuit breakers 29P, 33P, 34P, 35P, 36P, 37P, 38P, 39P -- starter bus PP1 As shown in figures 92--4 thru 92--7, the configuration of the main relay box 1VE varies with the helicopter series A, C, D and S. CHAPTER 92 Page 14 Revision 26 MBB HELICOPTERS MAINTENANCE MANUAL MBB B0 105 - EFFECTIVITY Series A, C S/N 181 and subsequent Figure 92-4 Main relay box 1VE B0 105 CHAPTER 92 Page 15/16 MBB HELICOPTERS MAINTENANCE MANUAL MBB B 0 105 - EFFECTIVITY Series A, C S/N 81 180 - Figure 92-5 Main relay box 1VE B0 105 CHAPTER 92 Page 17 MBB HELICOPTERS MAINTENANCE MANUAL MBB B0 105 - EFFECTIVITY Series A, C, S S/N 7 80 - Figure 92-6 B0 105 CHAPTER 92 Page 18 Main relay box 1VE MBB HELICOPTERS MAINTENANCE MANDAL MBB - B 0 105 EFFECTIVITY S e r i e s A, C, D S/N 7 160 - F i g u r e 92-7 Main relay box 1VE B 0 105 CHAPTER 9 2 Page 1 9 .MBB HELICOPTERS' MAINTENANCE MANUAL MBB B 0 105 - 92 -6 Relay box lOVE The relay box lOVE i s i n s t a l l e d i n t h e front end of t h e nose s h e l l , on t h e l e f t side below the cabin f l o o r (see figures 92-1 t o 92-3). Access t o t h e components of t h e relay box i s obtained by opening t h e nose door (see figures 92-8 and 92-9). The following components a r e i n s t a l l e d : 1. For N2 governor: - relays 4KA, 5KA and 6KA - diode matrix l O K A 2. For cyclic s t i c k trim: - r e t r a c t i o n relays 8CC, l O C C - extension relays 9CC, l l C C 3. Additional relays can be i n s t a l l e d f o r optional equipments. B0 105 CHAPTER 92 Page 20 MBB HELICOPTERS MAINTENANCE MANUAL MBB B0 105 - Figure 92-8 Relay box lOVE B0 105 CHAPTER 92 Page 21 MBB HELICOPTERS B0 105 MAINTENANCE MANUAL MBB - EFFECTIVITY S/N 101 and subsequent and series D Figure 92-9 B0 105 CHAPTER 92 Page 22 Relay box lOVE MBB HELICOPTERS MAINTENANCE MANUAL MBB - B0 105 92 -7 DC POWER SYSTEM 1. General The DC power system (see figure 92-10) mainly consists of the following: - - generator system battery system external power receptacle monitoring system In order t o produce and d i s t r i b u t e dc power t o the e l e c t r i c a l loads, the e l e c t r i c a l system must include relays, controls and busses. Engines 1 and 2 are s t a r t e d one a f t e r t h e other by means of two s t a r t e r generators. Voltage i s supplied by t h e airborne battery or by an external power source. When an engine has reached i d l e speed, i t s associated starter-generator w i l l produce power for t h e e l e c t r i c a l system. Each starter-generator i s connected t o a voltage regulator which maintains a constant generator output voltage. The connected loads a r e supplied via t h e busses. System voltage and current consumption a r e indicated by the voltmeter and ammeter respectively, i n s t a l l e d i n t h e horizontal section of the instrument panel (see figures 92-11 t h r u 92-13 and chapter 9 1 ) . Both generators and the airborne battery can be switched on and off and the generator f i e l d s s t i l l activated can be switched off. The consumers a r e protected by c i r c u i t breakers (see paragraph 92-14). Warning l i g h t s are used t o warn of generator failure, overheating of the airborne battery and overheating of the starter-generators (D s e r i e s only) Utilization of external power i s a l s o indicated. . 2. Technical data a . Airborne battery (See VARTA Maintenance Manual) - nominal voltage - nominal capacity - design - max. permissible discharge - manufacturer 2 4V 25 Ah 20 c e l l s (nickel-cadniium) 800 A VARTA B 0 105 CHAPTER 92 Page 23 .MBB HELICOPTERS MAINTENANCE MANUAL MBB B0 105 ' EXTERNAL POWER RECEPTACLE ' . 10 0 =: 9 REGULATOR 9 VOLTAGE REGULATOR 4) BATTERY 1 I ! 1 ! j I I - - - - -1 I I I I I I I 1 I 1--L + W STARTER BUS * PP20 EMERGENCY BUS MAlN BUS AUXlLlARY BUS $3 A EFFECTIVITY - - D series or when the optional emergency bus is installed Figure 92-10 B0 105 CHAPTER 92 Page 24 DC Power Supply (General) MBB HELICOPTERS MAINTENANCE MANUAL MBB B 0 105 - b . ~ t a r t e r - g e n e r a t o r (see LEAR SIEGLER Maintenance Manual) - nominal voltage - nominal c u r r e n t - nominal power - permissible current consumption a t S t a r t : - manuf a c t u r e r C. -8 .... 200 700A a t 23V Lear S i e g l e r Voltage r e g u l a t o r ( s e e LEAR SLEGLER Maintenance Manual) . . 27 . . . . 28,OV 27,5V t 0.lV DC v o l t a g e r e g u l a t o r with prot e c t i o n and monitoring function Lear S i e g l e r - a d j u s t i n g range - a d j u s t e d voltage - design - manuf a c t u r e r 92 2 8V 150A 4,5 kW Component l o c a t i o n - DC power system LOCATION FIGURE S t a r t e r - g e n e r a t o r s 103P, 203P Engine 1 and 2 ( s e e chapter 61) Airborne b a t t e r y 1 P Nose s e c t i o n , forward of t h e instrument panel 2VE 92-1 t o 92-3 External power r e c e p t a c l e 2P Nose s e c t i o n 92-1 t o 92-3 DC power system c o n t r o l s Instrument panel 2VE 92-1 t o 92-3 I n d i c a t o r s (voltmeter 18P and ammeter 19P) Instrument panel 2VE ( s e e chapter 91) 92-1 t o 92-3 92-11 t o 92-13 Warning l i g h t s Instrument panel 2VE, v e r t i c a l section (see chapter 92-133) S t a r t e r bus P P 1 S e r i e s C, D, S, IFR Main r e l a y box 1VE Table 92-1 Component l o c a t i o n 92-4 t o 92-7 - DC power system (1 of 2) B0 105 CHAPTER 92 Page 25 MBB HELICOPTERS MAINTENANCE MANUAL MBB B0 105 - COMPONENT LOCATION Emergency bus PP20 S e r i e s D, S/N 7 160 92-1 Main r e l a y box 1VE S e r i e s A, C S/N 161 and subsq. 92-2 Optional equipment, main r e l a y box 1VE Main bus PP21 S e r i e s A, C, D, S Main r e l a y box 1VE 92-1 t o 92-3 A u x i l i a r y bus PP22 S e r i e s A, C, D, S Instrument p a n e l 2VE 92-1 t o 92-3 Shunts 20P, 21P, 22P S e r i e s At C, D, S Main r e l a y box 1VE 92-1 t o 92-3 Voltage r e g u l a t o r 104P, 204P, 108P and 208P Main r e l a y box 1VE 92-4 t o 92-7 Generator r e l a y s 107P, 109P, 207P, 209P, llOP, 210P Main r e l a y box 1VE 92-4 t o 92-7 Circuit breakers See paragraph 92-14 Fuse 25P (300A) S e r i e s C, D Instrument panel 2VE Fuse 5 P (300A) Series S Below t h e engines next t o b a t t e r y F l i g h t e s s e n t i a l bus r e l a y 10P S e r i e s A, C, D and S Instrument panel 2VE B a t t e r y r e l a y 6P S e r i e s At C, D, S/N 7 160 92-1 S e r i e s A, C S/N 161 and subsq. 92-2 Instrument p a n e l 2VE Series S 92-3 Engine deck, a f t r i g h t E x t e r n a l power r e l a y 7P S e r i e s A, C, D S/N 7 160 92-1 S e r i e s At C S/N 161 and subsq. 92-2 Series S 92-3 Instrument p a n e l 2VE J u n c t i o n box 1W S e r i e s Al C, D, S Main r e l a y box Table 92-1 B 0 105 CHAPTER 92 Page 26 FIGURE - 92-1 92-1 t o 92-3 - - Component l o c a t i o n - DC power systern (2 of 2) MBB HELICOPTERS MAINTENANCE MANUAL MBB B0 105 - EFFECTIVITY Figure 92-11 Instrument Panel 2VE (Horizontal Section) B0 105 CHAPTER 92 Page 27/28 MBB HELICOPTERS MAINTENANCE MANUAL MBB B0 105 - EFFECTIVITY S/N 161 and subsequent Figure 92-12 Instrument Panel 2VE (Horizontal Section) B0 105 CHAPTER 92 Page 29 MBB HELICOPTERS' B0 105 MAINTENANCE MANUAL MBB - EFFECTIVITY Series D Figure 92-13 B0 105 CPMTER 92 Page 30 Instrument Panel 2VE (Horizontal Section)
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