UH-72 EPs and Limits | The Nose

Minimum Flight Crew

The minimum flight crew consists of one pilot operating the helicopter from the right seat.

Maximum Number of Occupants

The maximum number of occupants comprises up to 11 persons (including flight crew)

Maximum Gross Mass

3585 Kg or 7905 Lbs

Floor Loading Limits

The maximum allowable floor loading is 600 kg/m^2 or 123 lbs/ft^2
CAUTION
Cargo, baggage, and loose items must be properly stowed and tied down in order to make in-flight shifting impossible

TIe down ring limits

154 lbs or 70 Kg

Vne for OEI operations

110 kts

Vne for Autorotation

90 kts

Maximum Operating Altitudes

18,000 ft PA
Max for hover IGE/takeoff and landing is 18,000 ft DA or 18,000 ft PA, whichever is less

Flights with closed NACA inlets

Restricted to 30 minutes to prevent overheating

Minimum air temperature limit without cold weather kit installed

-30 C

Minimum air temperature with defective bleed air heating

10 C

Maximum Air Temperature

ISA + 35 C (Max 50 C)

Temperature limitations below -20 C

For engine startup at temperatures below -20 C, the battery shall be preheated to at least -20 C.

Rotor RPM Limitations

Condition (Power On)
Minimum Transient 85%
Minimum Continuous GM < 2000 kg 96%
Minimum Continuous GM > 2000 kg 96%
Maximum Continuous 104%
Partial Power (Max 5 min.) 106%
Maximum Transient (Max 12 sec.) 106%
Condition (Power Off)
Minimum Transient -
Minim

Engine start limitations as read from the FLI

Engine and transmission limitations for the AEO as read from the FLI

Engine and transmission limitations for OEI as read from the FLI

Engine oil pressure limitations

Minimum: 1.3 BAR
Caution range: 1.3 BAR to 1.5 BAR
Continuous operation: 1.5 BAR to 5.0 BAR
Maximum continuous: 5.0 BAR

Engine oil temperature limitations

Minimum for starting
Oil viscosity 3 cSt and 3.9 cSt: -45 C
Oil viscosity 5 cSt: -40 C
Minimum for power application
Oil viscosity 3 cSt and 3.9 cSt: -10 C
Oil viscosity 5 cSt: 0 C
Maximum operating temperature: 115 C

Starter/generator limits for engine start

External Power:
20 sec. - on
60 sec. - off
20 sec. - on
60 sec. - off
20 sec. - on
30 min. - off
Onboard Battery
30 sec. - on
30 sec. - off
30 sec. - on
30 sec. - off
30 sec. - on
30 min. - off

Starter/generator limits for engine ventilation

External Power:
15 sec. - on
60 sec. - off
15 sec. - on
60 sec. -off
15 sec. - on
23 min. - off
Onboard Battery:
20 sec. - on
60 sec. - off
20 sec. - on
60 sec. - off
20 sec. - on
23 min. - off

Maximum continuous load per generator/total maximum continuous load

Max. continuous load per generator: 200 A
Total maximum continuous load: 360 A

Transmission oil pressure limitations

Minimum: 1.0 BAR
Caution Range: 1.0 BAR to 1.5 BAR
Continuous Operation: 1.5 BAR to 5.0 BAR
Maximum Continuous: 5.0 BAR

Transmission oil temperature limitations

Continuous operation: -10 C to 105 C
Maximum: 105 C

Hydraulics system quantities

System 1: 1.0 L
System 2: 1.2 L

Prohibited flight maneuvers

Intentional touchdown autorotations
Aerobatic maneuvers
flight into icing conditions

Maximum wind velocity for starting and stopping the rotor

50 kts wind from all directions

Maximum rates of turn while at a hover

For gross mass up to 3200 Kg: Maximum is 45 degrees/sec.
For gross mass above 3200 Kg: Maximum is 30 degrees/sec.

Main rotor mast moment limitations

Maximum: red bar
Caution: yellow region
Normal Range: Left of yellow region

Slope operations terrain limitations

11 degrees down to the left
6 degrees down to the right
8 degrees down forward and aft

Configuration requirements for operations with opened or removed doors

A certified locking device for the hinged doors and/or the sliding door must be installed.
During single pilot night flight, it is not allowed to open/close the pilot's door in flight

Altitude restrictions associated with AFCS hands off and feet off operations

Takeoff/approach: 200 ft. AGL
Operations other than takeoff/approach: 500 ft. AGL

AFCS limitations

Minimum airspeed with IAS mode engaged: 30 kts
Maximum airspeed for hands on operation in cruise following a failure: 120 kts
Maximum airspeed for hands on operation in ILS approach following a failure: 100 kts
GS mode shall not be enagaged above the glid

SPIFR/DPIFR kit limitations

Minimum airspeed: 60 kts
Minimum airspeed for IFR approach: 70 kts
Maximum angle of bank: 20 degrees

Cargo hook limitations

Maximum external load mass: 1500 Kg
Maximum airspeed with external hook load: 100 kts
Minimum airspeed with trailing unloaded hook: 70 kts
Maximum angle of bank: 30 degrees

Rotor brake limitations

Rotor brake shall not be shut down until both engines are shut down and rotor RPM has dropped below 50%
Do not apply rotor brake at temperatures below -30 C
Allow for a minimum cooling period of 10 minutes before next application of rotor brake.
NOTE
In e

Engine fire (1 or 2) IN FLIGHT

1. OEI Flight condition, establish
2. Airspeed - Reduce if IAS is exceeding 100 kts
3. FIRE sw (affected engine) - Raise guard, press
4. BOT 1/BOT 2 pb - Press
- bottle 1 activated; EXT indicator light comes on
5. Clock stop watch - start (after BOT 1 leg

XMSN OIL PRESSURE

If one XMSN oil pressure indication is below 1.0 BAR:
1. Power - Reduce
2. Land As Soon As Practicable
If both indications are below 1.0 BAR:
3. Land Immediately

XMSN OIL TEMPERATURE

1. XMSN oil temperature and oil pressure indication - check
If indications are within limits:
2. Land As Soon As Practicable
If indications are above limits:
2. Power - Reduce, as much as possible
If oil temperature indication remains above limit:
3. Land

Single Engine Failure - Hover OGE

1. Collective lever - Adjust to maintain rotor RPM
2. Airspeed - increase is possible
FORCED LANDING
3. Landing attitude - establish
4. Collective lever - raise as necessary to stop descent and cushion landing
After landing
5. Affected engine - identify
6

Single Engine Failure - Hover IGE

1. Collective lever - adjust to OEI limits or below
2. Landing attitude - establish
3. Collective lever - raise as necessary to stop descent and establish cushion landing
After landing
4. Affected engine - identify
5. Single engine emergency shutdown - pe

Engine Overspeed Governor Failure

1. Collective raise to maintain N2/NR within limits
2. VARNR - Check MAN
3. N2 Trim Sw - try to trim Nro to 101% with matched torque
(If step 3 isn't possible, continue)
4. Affected engine - identify
5. Twist grip - affected engine rotate towards idle unt

Engine Underspeed Governor Failure

1. OEI Flight Condition - establish
2. Bleed air consumers - off
3. VARNR system - check MAN
4. Affected engine - identify
5. N2 Trim Sw - Compensate N2/Nro drop and try to match torque
6. Twist grip - release stop plate and rotate towards flight until N2

Autorotation

1. Collective lever - reduce
2. Airspeed 75 kts (between 60-90 kts)
3. Double-engine emergency shutdown - perform
-At approx. 100 ft. AGL: Flare attitude (approx. 15-20 deg.) to reduce forward speed and rate of descent; control NR
-At approx. 8-12ft AGL:

Tail rotor drive failure/fixed-pitch tail rotor control failure - forward flight

1. Collective lever - Reduce to obtain minimum sideslip angle
2. Airspeed - Maintain 70 kts or higher
3. Suitable landing area - select
4. Shallow approach with nose left - perform
IF AIRSPEED CAN BE REDUCED BELOW 40 KTS WITH NOSE STILL POINTING TO THE LE

Fire ENG 1 or ENG 2 (Ground)

1. Fire SW (affected engine) - raise guard, press
2. Both FUEL PRIME PUMPS - Check OFF
3. BOT 1/BOT 2 pb - Press; BOT 1 activated ; EXT light comes on
4. Clock stop watch - start (after BOT 1 legend and EXT indicator light go off)
5. Double engine emergen