Engine starting cycle (LSGI)
From time propeller rotates until stabilized LSGI shall not exceed 60 seconds
Engine starting cycle (HSGI)
From time propeller rotates until stabilized HSGI shall not exceed 65 seconds
Airstart limit (Speed, Altitude, TMT, Time)
Speed: should be between 150-180 KIAS
Altitude: Maximum 25,000'
Time: wait at least 5 minutes after shutdown and allow TMT to decrease to 250C or lower to reduce turbine wear
T56-A-427 Typical ground operations chart overall note
TMT & % RPM values in ground operations are valid for zero airspeed, no diffuser bleed, no accessory loading, and ambient air temperature from -54C to +55C
Start TMT Limit
830 Max (Note 2)
Stabilized start TMT
300-500
Max Reverse TMT
360-560
Flight Idle TMT
300-540
LSGI TMT
400-600
IHP Start limit
no limit
IHP Stabilized start limit
Minimum until oil temp is above 0C, 1,000 maximum at oil temp between 0-40C (Note 5)
Max reverse IHP
680-2000
Flight Idle IHP
1,100 (Nominal)
LSGI IHP
No limit
Start RPM
No limit
Stabilized Start RPM
95.5-99.3% RPM
Max Reverse RPM
96.5-105.5% RPM
Flight Idle RPM
94.5-99.3% RPM
LSGI RPM
71.0-72.1% RPM
Start Oil Pressure
positive oil pressure by 35% RPM
G/B Oil Pressure (Stabilized start, Max reverse, Flight Idle, LSGI)
150-250 PSI (180 Normal) (Notes 4 & 10)
P/S Oil Pressure (Stabilized start, max reverse, flight idle, LSGI)
50-60 PSI (100 permitted during start and warmup) (Note 9)
Engine oil temp (Start) w/ note 3
-40 Min (note 3: -40C is lower limit only when using MIL-L-23699. -54C is the lower limit if MIL-L-7808)
Engine oil temp (stab. start, max reverse, flight idle, LSGI)
50-90 (100 permitted for 30 minutes) (Note 5)
Maximum TMT
875 maximum (10 minute limit) (Note 11)
Military TMT
845 maximum (30 minute limit) (Note 11)
Normal TMT in flight
825 maximum (no time limit) (Note 11)
Transient TMT limit*
See note 12
Takeoff, MIL, MAX, normal IHP limit
5,100 (note 14)
Takeoff Mil, Normal, Max RPM limit
99-101 (note 13)
G/B Oil pressure (Max, Mil, Normal)
150-250 (180 Normal)
P/S Oil Pressure
50-60 PSI
Oil Temp (Max, Mil, Transient)
50-90 (Note 5)
Ground Ops note 1
Maximum time allowed at zero or negative G conditions is 8 seconds. Fluctuating oil pressure is allowed during and following zero G conditions: however, a Fx shutdown is required if: (a) oil pressure fluctuations continue longer than 15 seconds after retu
Ground Ops note 2
Refer to overtemperature operation table, this section, for engine start limits
Ground ops note 3
-40 C is lower limit using MIL-L-23699
-54 C is lower limit using MIL-L-7808
Ground ops note 4
operation below 150 PSI when RPM is below 100% RPM is permitted if 150 PSI can be maintained at 100% RPM. At operating oil temperature, a pressure of 100 PSI is normal at the LSGI condition
Ground ops note 5
Use minimum power for oil temperature below 0C, Maximum power is 1,000 ISHP for oil temperature between 0-50C or when ready for T/O, 40C and increasing. In flight, 100C is permitted for 5 minutes, then 90C is maximum
Ground ops note 6
Acceleration time from the start of rotation to stabilized start at normal ground idle shall not exceed 65 seconds. Acceleration time from the start of rotation to LSGI shall not exceed 60 seconds
Ground ops note 7
If the engine cannot be operated within the limits of this table, maintenance action is required. Record max/min gauge reading and duration
Ground ops note 8
Use of power between ground idle and reverse in LSGI can cause engine RPM to decay. If RPM decay occurs, advance the power lever. If the decay continues, shut down the engine
Ground ops not 9
Operation below 50 psi when the engine is at LSGI is permitted if 50 PSI can be maintained when the engine is at normal ground idle. At operating oil temperature, 42 psi is normal at the LSGI condition
Ground ops note 10
When starting engines, engine oil low light and / or higher than normal oil pressure may be experienced prior to attaining normal oil temperature. Closely monitor pressures above 250 psi because the relief valve may mask an impending oil system malfunctio
Engine ops note 11
acceptable range of maximum TMT is 855-875C (Normal is 865) Continuous operation above normal temperatures shall not exceed 40 minutes (10 minutes at maximum power and 30 minutes at military power) per flight
Engine ops note 12
Transient engine operation may result in exceeding steady engine limitations. The following transient limitations apply. (a) TMT 930C permitted for 3 seconds (b) ISHP. up to 6,000 ISHP permitted for 3 seconds. If ISHP limit is exceeded for more than 3 sec
Engine ops note 13
Steady state engine operation below 99% RPM may be encountered during low altitude / .ow airspeed flight whenever power lever is near flight idle
Engine ops note 14
Below 180 KIAS, 5,100 ISHP is the maximum allowable, for 180 KIAS and above, 4,600 ISHP is maximum allowable
Max airspeed, smooth air, clean
300 KIAS
Severe turbulence airspeed limit
at least 150 KIAS, but do not exceed 150 KIAS at S.L. increased by 1 knot/1,000' up to 30,000; above 30,000, do not exceed 180 KIAS, reduced by 3 knots / 1,000'
Max speed with landing gear down
300 KIAS
max speed during extension / retraction of landing gear
190 KIAS
max speed flight with flaps extended
190 KIAS
Max airspeed on deck with power levers below flight idle
130 KIAS (
N
for every 10F, increase above standard day temp of 59F and/or every 1,000' increase indicated pressure altitude above S.L., decrease maximum airspeed on deck with power levers below flight idle by 1/2 knot
Maximum recommended tire speed on touchdown
174 knots ground speed
Approximate max permissible accelerations at higher GW
reduce load factor by 0.10 G for every 2,000# above 47,500#
G limits with flaps in power approach configuration
0-2.0 G
Max FWD C.G. limit (up/down)
22.0 MAC (gear up); 22.5 MAC (gear down)
Max AFT C.G. limit (up/down)
26.0 MAC (gear up); 26.5 MAC (gear down)
Prohibited maneuvers
(1.) Practice approach to stalls with inoperative AOA indicator
(2.) practice approach to stalls at less than 15,000' AGL
(3.) Practice approach to stalls with STAB AUG switch ON
(4.) Practice approach to stalls with power greater than 1,500 IHP per engin
Brake application speed equation
At or below 46,500#: 80 knots
Above 46,500#: 80 minus 1 knot per 1,000# above 46,500#
Emergency braking speeds
53,001-55,000#: 93 knots
46,501-53,000#: 95 knots
53,001-55,000#: 100 knots
**
True Airspeeds for S.L. STD Day conditions
**