TECHNICAL BULLETIN
No.
427-01-1
DATE
Date
03-14-01
REV
Page
1 of 4
A Subsidiary of Textron Inc.
MODEL AFFECTED:
427
SUBJECT:
FUEL TRANSFER CONTROL UNIT (FTCU) P/N
427-375-010-101, REPLACEMENT OF
HELICOPTERS AFFECTED:
Model 427 helicopters serial number 56001
through 56024.
[Model 427 helicopters serial numbers 56025 and
subsequent will have the intent of this bulletin
accomplished prior to delivery.]
COMPLIANCE:
Bell Helicopter recommends accomplishment of
this bulletin at next scheduled 600 Hour/Annual
inspection.
DESCRIPTION:
This bulletin introduces an improved FTCU P/N 427-375-010-103. Installation of the
new FTCU will increase the unit reliability in cold ambient air temperature operations.
APPROVAL:
The engineering design aspects of this bulletin are Transport Canada approved.
MANPOWER:
Approximately 2 man-hours are required to complete this bulletin. Man-hours are
based on hands-on time, and may vary with personnel and facilities available.
AN APPROPRIATE ENTRY SHOULD BE MADE IN THE AIRCRAFT LOGBOOK UPON ACCOMPLISHMENT
IF OWNERSHIP OF AIRCRAFT HAS CHANGED PLEASE FORWARD TO NEW OWNER
T.B. 427-01-1
Page 2 of 4
WARRANTY:
Owners/operators of 427 helicopters who comply with the instructions outlined in this
bulletin are eligible for a special 100% warranty credit toward the purchase of the parts
contained in the "Required Material" section of this bulletin.
To receive this credit:
- Customers must order the replacement parts from an approved BHTI supply source.
- Comply with the instructions outlined in this bulletin no later than March 31, 2002.
- Send a completed Malfunction Report (MR) to BHT Warranty Administration. A copy
of the invoice referencing parts used to accomplish this bulletin must be attached to
the Malfunction Report.
- NOTE Customers who fail to comply with the instruction in this
bulletin after March 31, 2002 are not eligible for the special
warranty credit provisions listed above.
MATERIALS:
Required Material:
The following material is required for the accomplishment of this bulletin and may be
obtained through your Bell Helicopter Textron Supply Center.
Part Number
Nomenclature
427-375-010-103
Fuel Transfer Control Unit
SPECIAL TOOLS:
None required.
WEIGHT AND BALANCE:
Not affected.
ELECTRICAL LOAD DATA:
Not affected.
Quantity
1
T.B. 427-01-01
Page 3 of 4
REFERENCES:
BHT-427-IPC Illustrated Parts Breakdown
BHT-427-MM Maintenance Manual
PUBLICATIONS AFFECTED:
BHT-427-IPC Illustrated Parts Breakdown
ACCOMPLISHMENT INSTRUCTIONS:
1. Insure all power is removed from the aircraft.
2. Remove the tailboom access door (refer to BHT-427-MM chapter 53). The Fuel
Transfer Control Unit (FTCU) is located on the forward bulkhead of the tailboom
attachment compartment
3. Disconnect the 2 electrical connectors (2800CM1P1) and (2800CM1P2) from the
FTCU P/N 427-375-010-101.
4. Remove the 4 screws retaining the FTCU on the bulkhead and retain the hardware.
5. Install the new FTCU P/N 427-375-010-103 using the retained hardware. The
receptacle "JA" is located on top and the Light Emitting Diodes (LED) are facing
towards the tailboom access door.
6. Connect the connector (2800CM1P1) to receptacle "JA" and connector
(2800CM1P2) to receptacle "JB" on the FTCU.
- NOTE Do not perform the following operational test when fuel
quantity indication is between 200 and 1000 Lbs. Within this
range fuel transfer pumps operation is not constant.
7. Apply power to the aircraft.
8. Verify that the #1 and #2 fuel transfer pump switches located on the
overhead console are in the "AUTO" mode.
9. Verify that no Light Emitting Diodes (LED) are illuminated on the
FTCU.
T.B. 427-01-1
Page 4 of 4
10. Verify that the #1 and #2 fuel transfer pumps symbol on the IIDS
display are of white color (operating) if the fuel quantity is between 0
to 200 Lbs. or 1000 lbs. and above.
11. Pull the #1 "FUEL XFR CONT" circuit breaker. Verify that the "1
FUEL XFR SYS" caution is illuminated on the IIDS and the pump
symbol is of cyan color.
12. Reset the master caution and push back in the "FUEL XFR CONT"
circuit breaker. Verify that the "1 FUEL XFR SYS" caution is
extinguished and the pump symbol is of white color (operating).
13.
Pull the #2 "FUEL XFR CONT" circuit breaker. Verify that the "2
FUEL XFR SYS" caution is illuminated on the IIDS and the pump
symbol is of cyan color.
14.
Reset the master caution and push back in the "FUEL XFR CONT"
circuit breaker. Verify that the "2 FUEL XFR SYS" caution is
extinguished and the pump symbol is of white color (operating).
15.
Remove power from the aircraft.
16.
Re-install tailboom access panel (refer to BHT-427-MM chapter 53).
17.
Annotate helicopter records to reflect compliance with this bulletin.