T-6B Operational Limits Flashcards
Engine Operating Limits for Takeoff/Max Power Setting
Torque %: 100 MAX
ITT (°C) Max: 820 MAX
N₁ %: 104 MAX
Nₚ %: 100 MAX
* (With PMU off, permissible maximum Nₚ is 100 +/- 2%)
Oil Pressure (psi): 90 to 120
* (Normal oil pressure during steady state conditions is 90 to 120 psi. Operation at oil pressure less than 90 psi at flight idle or above is indicative of oil system malfunction)
Oil Temp (°C): 10 to 105
Engine Operating Limits for Idle Power Setting
Torque %: 1 to 10% (ground)
* (Allowable allowable torque range with Np stabilized and PCL at IDLE)
ITT (°C) Max: 750 MAX
N₁ %: 60 to 61 (ground) / 67 Min(flight)
Nₚ %: 46 to 50 (ground)
Oil Pressure (psi): 90 Min
Oil Temp (°C): -40 to 105 (Grnd),10 to 105 (Flt),106 to 110 (Acceptable for ground operation at and below 20% torque)
Engine Operating Limits for Start Power Setting
ITT (°C) Max: 871 - 1000 (for 5 sec)
Oil Pressure (psi): 200 Max
Oil Temp (°C): -40 Min
Engine Operating Limits for Transient Power Setting
Torque %: 101-107 MAX (for 5 sec)
* (Torque at 132% is a materials limit above which damage to the engine may occur. Torque above 102% is indicative of a system malfunction)
ITT (°C) Max: 821 - 870 (for 20 sec)
N₁ %: 104 MAX
Nₚ %: 110 (for 20 sec)
* (Permissible at all powers for completion of in-flight emergency)
Oil Pressure (psi): 40 to 130
* (Operation in this range permitted only during aerobatics or spins, and 15 to 40 psi for 5 seconds with PCL at IDLE.)
Oil Temp (°C): 106 to 110 (for 10 minutes)
(2) With PMU OFF, permissible maximum Nₚ is ____.
100 +/- 2%
(4) Avoid stabilized ground operation from ____ Nₚ.
62 to 80%
(5) Operation in this range permitted only during aerobatics or spins, and ____ to ____ psi for ____ seconds with PCL at IDLE.
15 to 40 psi for 5 seconds
(6) Normal oil pressure during steady state conditions is ____. Operation at oil pressure less than ____ at flight idle or above is indicative of oil system malfunction.
90 to 120 psi
90 psi
(7) Acceptable for ground operation at and below ____ torque.
20%
(8) The PMU will govern maximum torque at ____. Torque above ____ at a constant PCL setting and steady flight is indicative of a governing system malfunction.
100 +/- 2%
102%
Maximum Airspeed Gear Down (Vle) and Flap Down (Vfe)
150 KIAS
Max Operating (Vmo) Speed
316 KIAS
Max Mach (Mmo)
0.67 MACH
Turbulent Air Penetration Speed, Maximum:
207 KIAS
T-6B Prohibited Maneuvers
- INVERTED STALLS
- INVERTED SPINS
- SPINS WITH PCL ABOVE IDLE
- SPINS WITH THE LANDING GEAR, FLAPS, OR SPEEDBRAKE EXTENDED
- SPINS WITH PMU OFF
- AGGRAVATED SPINS PAST TWO TURNS
- SPINS BELOW 10,000 FEET PRESSURE ALTITUDE
- SPINS ABOVE 22,000 FEET PRESSURE ALTITUDE
- ABRUPT CROSS-CONTROLLED (SNAP) MANEUVERS
- AEROBATIC MANEUVERS, SPINS, OR STALLS WITH A FUEL IMBALANCE GREATER THAN 50 POUNDS BETWEEN WINGS
- TAIL SLIDES
Minimum Battery Voltage
22.0 VOLTS
The aircraft has been approved only for transit through ____ of ____ ice.
5000 feet
LIGHT RIME
Hydraulic Caution
< 1800 psi
> 3500 psi
Fuel Caution Light
< 110 pounds in respective wing tank
Cockpit Pressurization Schedule Limit
3.6 +/- 0.2 psi
Starter Cycle Limitations:
STARTER DUTY CYCLE IS LIMITED TO: FOUR 20 SEC CYCLES
COOLING PERIOD AFTER FIRST STARTER CYCLE: 30 SEC
COOLING PERIOD AFTER SECOND STARTER CYCLE: 2 MIN
COOLING PERIOD AFTER THIRD STARTER CYCLE: 5 MIN
COOLING PERIOD AFTER FOURTH STARTER CYCLE: 30 MIN
Inverted Flight Limitation
60 secs
Intentional Zero G Flight
5 secs
Negative G Operations
60 sec
Do Not Exceed -2.5 G For Longer Than:
30 sec
Min. Pos. Gs Upright Before Additional Neg Gs
60 secs
Symmetric Clean Accel Limit:
+7.0 to -3.5 Gs
Symmetric Gear & Flaps Extended Limit
+2.5 to 0.0 Gs
Asymmetric Clean Acceleration Limit
+4.7 to -1.0 Gs
Uncoordinated Rolling Manuevers Initiated at ____ G Shall Be Limited to a ____ degree bank angle change.
-1 G
180°
Min Voltage for Battery Start
23.5 Volts
Max Crosswind For Dry Runway
25 kts
Max Crosswinds For Wet Runway
10 kts
Max Crosswind For Icy Runway
5 kts
Max Tailwind Component For Takeoff
10 kts
Max Fuel Flow
799 PPH or less
Inflight AMPS Limits/Range
-2 to +50 Amps
Ground/Inflight Voltage
28.0 to 28.5 Volts
Max IOAT for Engine Start
80°C
Max Operating Speed
316 KIAS
Max Speed w/ Flaps & Gear Extended
150 KIAS
Max Turbulent Airspeed Penetration
207 KIAS
**Recommended 180 KIAS
Max Maneuvering Speed
227 KIAS
The speed above which full or abrupt control movements could result in structural damage to the aircraft
Max Ramp Weight
6950 lbs
Max Takeoff Weight
6900 lbs
Max Landing Weight
6900 lbs
Max Zero Fuel Weight
5850 lbs
Max Baggage Weight
80 lbs
Max Fuel Imbalance
50 lbs between wings
Total Usable Fuel
1100 lbs
**From single point refueling method
