UH-72 Emergency Procedures

The urgency of landing is paramount. Primary consideration is to ensure the survival of occupants. Landing in water, trees, or other unsafe areas should only be considered as a last resort.

Land without delay at the nearest adequate site (i.e. open field) at which a safe approach and landing can be made

The landing site and duration of flight are at the discretion of the pilot. Extended flight beyond the nearest approved landing area where appropriate assistance can be expected is not recommended.

Conditions/Indications: Respective N1 below threshold value

• 1. OEI Flight Condition - Establish
• 2. Affected Engine - Identify
• 3. Single Engine Emergency Shutdown - Perform
• 4. LAND AS SOON AS PRACTICABLE

• 1. Fire Switch (affected engine) - Raise guard, press. (NOTE: Affected engine will shut down automatically. ACTIVE indicator light, BOT 1 legend, and F VALVE CL caution indicator come on. FIRE legend remains on as long as overheat condition exists.
• 2. Both FUEL PRIME PUMPS - Check OFF
• 3. BOT 1 / BOT 2 pushbutton - Press. Bottle 1 activated. EXT indicator light comes on. (NOTE: Extinguisher bottle will begin discharging when N1 goes below 50%. After discharge of bottle contents, BOT 1 legend and EXT indicator light go off, BOT 2 pushbutton legend comes on)
• 4. Clock stopwatch - Start
• 5. Double Engine Emergency Shutdown - Perform
• 6. Passengers - Alert / Evacuate
• If situation permits and FIRE warning light is still on after 1 minute:
• 7. BOT 1 / BOT 2 Pushbutton - Press. Bottle 2 activated. EXT indicator light comes on.
• 8. BAT MSTR switch - OFF

• 1. OEI flight condition - Establish
• 2. Airspeed - Max 100 KIAS
• 3. FIRE Switch (affected engine) - Raise Guard, press. (NOTE: Affected engine will shutdown automatically. ACTIVE indicator light, BOT 1 legend, and F VALVE CL caution indication come on. FIRE legend remains on as long as overheat condition exists.
• 4. BOT 1 / BOT 2 Pushbutton - Press. Bottle 1 activated. EXT indicator light comes on. (NOTE: Extinguisher bottle will begin discharging when N1 is below 50%. After discharge of bottle, BOT 1 legend and EXT indicator light go off, BOT 2 pushbutton legend comes on.
• 5. Clock Stopwatch - Start
• 6. Affected Engine - Identify
• 7. Single Engine Emergency Shutdown - Perform
• 8. Passengers - Alert
• 9. LAND AS SOON AS POSSIBLE
• If FIRE warning is still on after 1 minute:
• 10. BOT 1 / BOT 2 Pushbutton - Press. Bottle 2 activated. EXT indicator light comes on.
• If FIRE warning remains on:
• 11. LAND IMMEDIATELY

• 1. Fuel Quantity indication - Check
• If positive fuel indication in the main tank:
• 2. Both FUEL PUMPS XFER switches - Check ON
• 3. Both XFER PUMP Circuit Breakers - Check in
• If both LOW FUEL warning lights remain ON:
• 4. LAND WITHIN 10 MINUTES
• If one LOW FUEL warning light remains ON:
• 5. Expect Single Engine Failure

• If one XMSN oil pressure indication is below 1.0 bar:
• 1. Power - Reduce
• 2. LAND AS SOON AS PRACTICABLE
• If both XMSN oil pressure indications are below 1.0 bar:
• LAND IMMEDIATELY
• (NOTE: Descend with minimum power)

• CAUTION: The max remaining operating time is approximately 30 minutes
• 1. INST COOL circuit breaker - Check In
• If AVIO OVHT caution indication remains ON:
• 2. LAND AS SOON AS PRACTICABLE
• 3. Airspeed - Maintain as high as possible for best cooling effect

If rotor is 95% or less, steady light and low-pitch beeping tone. If rotor is 106% or above, flashing light and warning gong. If rotor exceeds 110%, flashing light and steady high-pitch tone.

• 1. Rotor RPM Indicator - Check
• 2. Collective Lever - Adjust as necessary to maintain rotor within normal range.

• 1. Affected Engine - Identify
• 2. Single Engine Emergency Shutdown - Perform

• 1. OEI Flight Condition - Establish
• 2. Affected Engine - Identify
• ALT 1: Single Engine Emergency Shutdown - Perform
• ALT 2: Twist grip (affected engine) - Rotate slowly to IDLE, check indications
• CAUTION: The second alternative enables the crew to use the affected engine for landing if necessary. Be prepared for engine failure. Monitor N1, TOT, Torque, Oil Pressure, and Temperature of affected engine closely. If the parameters fluctuate or limits are exceeded, perform single engine emergency shutdown immediately.
• 3. LAND AS SOON AS PRACTICABLE

• 1. Engine Oil Pressure - Check
• 2. OEI Flight Condition - Establish
• 3. Affected Engine - Identify
• 4. Single Engine Emergency Shutdown - Perform
• 5. LAND AS SOON AS PRACTICABLE

• Only ONE caution indication:
• LAND AS SOON AS PRACTICABLE (be prepared for single engine failure)

• BOTH caution indications:
• LAND AS SOON AS POSSIBLE (be prepared for dual engine failure)

• 1. Affected GEN switch - OFF
• CAUTION: If GEN OVHT caution indication remains ON and if there are indications of a fire (e.g. burning odor or smoke), shut down the affected engine.
• If GEN OVHT caution indication remains on for more than 1 minute:
• 2. OEI flight condition - Establish
• 3. Affected Engine - Identify
• 4. Single Engine Emergency Shutdown - Perform
• 5. LAND AS SOON AS PRACTICABLE

• 1. XMSN Oil Temperature and Pressure Indications - 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 AS SOON AS POSSIBLE

• Yaw left, change in engine noise.
• Indicators on the affected engine: ENG FAIL, ENG SPLIT, ENG OIL P, FUEL PRESS, GEN DISCON, OVSP FAIL, and VAR NR caution indications. NORM/MAN pushbutton will illuminate with yellow MAN.
• System instruments will indicate power loss.

• 1. Collective Lever - Adjust to maintain Rotor RPM
• 2. Airspeed - Increase if possible
• 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 Emergency Shutdown - Perform

• 1. Collective Lever - Adjust to maintain Rotor RPM
• 2. Airspeed - Increase if possible
• 3. Collective Lever - Adjust to OEI limits or below
• 4. Rotor RPM - Trim to maximum
• 5. Airspeed - Gain, 65 KIAS (VY)
• AFTER REACHING SAFE ALTITUDE:
• 6. Collective - Reduce to OEI MCP or below
• 7. Affected Engine - Identify
• 8. Single Engine Emergency Shutdown - Perform
• 9. LAND AS SOON AS PRACTICABLE

• 1. OEI Flight Condition - Establish
• 2. Rotor Speed - Trim to Maximum
• 3. Affected Engine - Identify
• 4. Single Engine Emergency Shutdown - Perform
• 5. LAND AS SOON AS PRACTICABLE

• 1. Rotor Speed - Trim to Maximum
• 2. Affected Engine - Identify
• 3. Single Engine Emergency Shutdown - Perform
• 4. Single Engine Landing Procedure - Perform

NOTE: The VAR NR system will revert to the manual mode automatically. Before performing an inflight engine shutdown, determine if the situation will allow for OEI flight. Make certain that: The controls of the affected engine are selected, and; the collective lever is adjusted to maintain the normal engine within OEI limits.

• 1. Twist Grip (affected engine) - Rotate slowly to IDLE, check indications, then to OFF.
• Bleed air heating will be shut down automatically, however, depending on power margin of the remaining engine, may be re-engergized as follows:
• 2. BLD HTG EMER/NORM switch - EMER
• 3. BLD HTG rheostat - ON

• VAR NR caution, Rotor RPM decrease.
• On the affected engine, ENG SPLIT caution, Torque decrease to zero, N1 decrease, N2 increase above NRO and then either drops back to 100% or increases to 123.1%, causing the overspeed protection system to shut down the engine automatically.
• On the normal engine, Torque, N1 and TOT will increase. N2 will decrease.
• CAUTION: When an engine has been shutdown by its overspeed protection system, the other engine's system is interlocked to an inactive status. Thus, the normal engine is no longer protected against power turbine overspeed.

• 1. OEI Flight Conditions - Establish
• 2. Affected Engine - Identify
• 3. Single Engine Emergency Shutdown - Perform
• 4. LAND AS SOON AS PRACTICABLE

• ROTOR RPM warning light may come on
• VAR NR caution indication may come on
• ENG SPLIT caution indication may come on
• NRO and both N2 increase
• Affected engine: Torque, N1, and TOT increase
• Normal engine: Torque and TOT may decrease

• 1. Collective lever - Raise as necessary to maintain N2 and NRO within limits
• 2. VAR NR system NORM/MAN switch - Check MAN
• 3. N2 TRIM Switch - Try to trim NRO to 101% with matched torque
• If Step 3 is not possible
• 4. Affected engine - Identify
• 5. Twist Grip (affected engine) - Rotate toward IDLE until N2 and NRO stabilize in normal range and FLI needles match
• 6. LAND AS SOON AS PRACTICABLE

• Approach and Landing recommendations: Make normal power changes to allow the normal engine to operate within limits. If more collective input is needed, adjust power of the affected engine using the twist grip.
• AFTER LANDING: Rotate twist grip (affected engine) towards IDLE before lowering the collective lever to full-down (maintain NRO and N2 within limits).
• CAUTION: N2 RPM OVER 123.1% MAY RESULT IN AN ENGINE OVERSPEED (AUTOMATIC SHUTDOWN)