FP-2
T-44 Ops Limits
Overview
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System Limitations
Propeller Limitations
Starting Limitations
Engine Limitations
Airspeed Limitations
Miscellaneous Limitations
Instrument Markings
Limit above or below which continued operation
is likely to cause damage or shorten life
Safe or normal range of operation
Special attention should be given…Operation is
permissible, but should be avoided
Power Definitions
Max Allowable
Max power available from the engines for
takeoff. Time limited to 5 minutes.
Max Continuous
Max power available from the engines not
time limited. Intended for emergency use.
Cruise Climb
The maximum power approved for a
normal climb.
Cruise
Power required to maintain level flight at a
desired altitude and normal airspeed. Cruise
power will vary w/ altitude & airspeed.
Propeller Limitations
Propeller RPM (N2)
Normal:
1800 - 2200 RPM
Maximum:
2200 RPM
Acceleration: 2420 RPM (2 sec)
Max Reverse: 2100 RPM
900-1100 RPM
Idle:
--> else low pitch torque check
Overspeed Test:
1900-2100 RPM
Overspeed Gov:
2288 +/- 40 (4%)
Fuel Topping:
2332 RPM (6%)
--> resets overspeed gov
Note: N2 limits are NOT propeller limitations, but instead
correspond to stress limits of the engine power section
Starter Limitations
Starting Limitations
Min VDC for APU Charge
18 VDC
Min VDC for APU Start
20 VDC
Min VDC for Batt Start
22 VDC
Starter Cycle:
40 sec on, 60 sec off
40 sec on, 60 sec off
40 sec on, 30 min off
Start ITT Limitations
1. ITT 1090
____ deg C for __
2 seconds
-- ITT approaches 925
___ deg C
-- Stop start, check BATT, APU start?
-- Report temp & duration if > 925 deg C
2. ITT on operative engine approaches 790
___ deg C
-- Stop start
-- Reset N1 to 85 percent & reattempt the start
Engine Limitations
Engine Torque
Max Time
RPM RPM
2200 1900
Max Allowable
5 Minutes
1315
Max Continuous
Continuous
1315 1520
1520
Cruise Climb
Continuous
1315 1520
1520
Cruise
Continuous
1315 1520
1520
Acceleration
2 Seconds
2100
Condition
Note 1: Torque limits between 1900 and 2200 RPM vary linearly
between 1315 and 1520 Ft-Lb
ITT
Condition
Max Allowable
Max Continuous
Cruise Climb
Cruise
Lo-Idle
Starting
Acceleration
Max Reverse
Max Time
5 Minutes
Continuous
Continuous
Continuous
Continuous
2 Seconds
2 Seconds
1 Minute
Max ITT
790
790
790
790
765
765
740
740
685
685
1090
1090
850
850
790
790
Note 1: High ITT in Lo-Idle may be decreased by reducing accessory load and/or
increasing N1 speed
Note 2: High gen loads at low N1 speeds may cause the ITT acceleration temp limit to
be exceeded. Observe the generator load limits for specific N1 speeds (See
chart in NATOPS, pg. 4-5).
CAUTION
Engine torque and ITT limits are determined
by ambient temperature. During operations
requiring maximum engine performance, be
aware of whether torque, or ITT limits
govern. Remember, cold temperature or low
altitude - torque limited, while hot
temperature or high altitude is ITT limited.
N1 %
Condition
Max Allowable
Max Continuous
Cruise Climb
Cruise
Acceleration
Max Reverse
Max Time
N1 %
5 Minutes
Continuous
Continuous
Continuous
2 Seconds
1 Minute
101.5
101.5
101.5
101.5
102.6
86
Note 1: Ground operations above 3500 foot pressure altitude (PA)
may produce idle speeds as high as 83-percent N1 at low idle.
Note 2: For every 10 deg C below -30 deg C ambient temperature,
reduce maximum allowable N1 by 2.2%
Anybody from Wyoming???
Oil Pressure & Temperature
Condition
Max Allowable
Max Continuous
Cruise Climb
Cruise
Hi-Idle
Lo-Idle
Starting
Acceleration
Max Reverse
Max Time
PSI
5 Minutes
Continuous
Continuous
Continuous
Continuous
Continuous
-----2 Seconds
1 Minute
85 - 100
85 - 100
85 - 100
85 - 100
-----40 (min)
----------85-100
Deg C
10 - 99
10 - 99
10 - 99
10 - 99
-40 - 99
-40 - 99
-40 (min)
10 - 99
10 - 99
Oil Pressure & Temperature
Notes
-- Normal oil pressure is 85-100 PSIG at power settings above
72% N1.
-- Oil pressure below 85 PSIG is undesirable and may be
used only for completion of a flight, and then at a
reduced power setting. Low oil pressure should be
corrected prior to next flight.
-- During ground operations, oil pressures below 40 PSIG
require engine shutdown
-- During flight, oil pressure below 40 PSIG is unsafe and
requires either engine shutdown or use of minimum
power until a landing can be made.
Airspeed Limitations
25
Airspeed Limitations
Aircraft Speed
SL to 15,500 FT
227 KIAS
Aircraft Speed
15,500 - 30,000 FT
See Note
Smooth Air
Gear & Flaps Down
140 KIAS
Turbulent Air
Gear & Flaps Down
140 KIAS
Landing Gear
Extension
155 KIAS
Landing Gear
Retraction
145 KIAS
Flaps
Extension 35% (App)
174 KIAS
Flaps
Extended 100% (Full)
140 KIAS
Note: Decrease speed 4 KIAS for every 1000 ft above 15,500 ft
Miscellaneous Limitations
Fuel Management
** Do not takeoff if gauges are in the yellow arcs or < 265 lbs
** AVGAS is limited to 150 hours before overhaul
** Both boost pumps must be operable prior to takeoff
** Suction boost limited to 10 hrs between fuel pump overhaul
Weight Limitations
Max Ramp
9710 lbs
Max Takeoff
9650 lbs
Max Landing
9168 lbs
Caution
The following actions may result in aircraft
damage and SHALL be avoided:
-- Landing on arresting gear cable
-- Nosewheel contact with cable risers above taxi speed
-- Braking during cable rollover
-- Operation above taxi speed over arresting gear rigged
with boots (tire segments)
Questions ???