FP-2FP-2

T-44 Ops LimitsT-44 Ops Limits

Overview• System Limitations

• Propeller Limitations

• Starting Limitations

• Engine Limitations

• Airspeed Limitations

• Miscellaneous Limitations

Instrument MarkingsInstrument 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 Continuous

Cruise Climb

Cruise

Max power available from the engines for takeoff. Time limited to 5 minutes.

Max power available from the engines not time limited. Intended for emergency use.

The maximum power approved for a normal climb.

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:

Maximum:

Acceleration:

Max Reverse:

Idle:

Overspeed Test:

Overspeed Gov:

Fuel Topping:

1800 - 2200 RPM

2200 RPM

2420 RPM (2 sec)

2100 RPM

1900-2100 RPM --> resets overspeed gov

900-1100 RPM --> else low pitch torque check

Note: N2 limits are NOT propeller limitations, but instead

correspond to stress limits of the engine power section

2288 +/- 40 (4%)

2332 RPM (6%)

Starter Limitations

Starting Limitations

Min VDC for APU Charge

Min VDC for APU Start

Min VDC for Batt Start

Starter Cycle:40 sec on, 60 sec off40 sec on, 60 sec off40 sec on, 30 min off

18 VDC

20 VDC

22 VDC

Start ITT Limitations

1. ITT ____ deg C for __ seconds

-- ITT approaches ___ deg C

-- Stop start, check BATT, APU start?

-- Report temp & duration if > 925 deg C

2. ITT on operative engine approaches ___ deg C

-- Stop start

-- Reset N1 to 85 percent & reattempt the start

1090 2

925

790

Engine Limitations

Engine Torque

Note 1: Torque limits between 1900 and 2200 RPM vary linearly between 1315 and 1520 Ft-Lb

Max Allowable

Max Continuous

Cruise Climb

Cruise

Acceleration

5 Minutes

Continuous

Continuous

Continuous

2 Seconds

1315

1315

1315

1315

RPM 2200

RPM 1900

1520

1520

1520

Condition Max Time

2100

1315

1315 1520

1315 1520

1315 1520

2100

ITT

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).

Max AllowableMax ContinuousCruise ClimbCruiseLo-IdleStartingAccelerationMax Reverse

5 MinutesContinuousContinuousContinuousContinuous2 Seconds2 Seconds1 Minute

7907907657406851090850790

Max ITT Condition Max Time

7907907657406851090850790

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 %

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%

Max AllowableMax ContinuousCruise ClimbCruiseAccelerationMax Reverse

5 MinutesContinuousContinuousContinuous2 Seconds1 Minute

101.5101.5101.5101.5102.686

N1 % Condition Max Time

Anybody from Wyoming???

Oil Pressure & Temperature

Max AllowableMax ContinuousCruise ClimbCruiseHi-IdleLo-IdleStartingAccelerationMax Reverse

5 MinutesContinuousContinuousContinuousContinuousContinuous ------2 Seconds1 Minute

85 - 10085 - 10085 - 10085 - 100 ------40 (min) ------ ------85-100

PSI Condition Max Time

10 - 9910 - 9910 - 9910 - 99-40 - 99-40 - 99-40 (min)10 - 9910 - 99

Deg C

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.

25

Airspeed Limitations

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 ???