UH-72A Emergency Procedures Exam (RFM v.29)
Tail Rotor Drive Failure/Fixed-pitch Tail Rotor Control Failure - Forward Flight Conditions/Indications: Procedure: (CASSAL - AA - A)
*Conditions/Indications* - No directional response after pedal inputs and/or - Complete loss of tail rotor thrust and/or - Locked pedals *NOTE:* The procedure will vary depending on flight conditions, power setting and mass of the helicopter. *Procedure* 1. Collective lever - Reduce to obtain minimum sideslip angle 2. Airspeed - Maintain 70 KIAS or higher 3. Suitable landing area - Select *NOTE:* Landing surface should be hard (e.g. concrete, asphalt) and flat. *NOTE:* Left crosswind is advantageous 4. Shallow approach with nose left - Perform *If the airspeed can be reduced below 40 kts with the nose still pointing to the left:* 5. Airspeed - Reduce close to the ground until nose is aligned with the flight direction 6. Landing - Perform *If the nose direction changes from left to right at airspeeds higher than 40 kts:* 5. Airspeed - Increase 6. Approach - Abort, climb to sufficient height for autorotation *NOTE:* Headwind is advantageous 7. Autorotation - Perform *NOTE:* In final phase of flare the helicopter can yaw to the left due to friction effects. *NOTE:* Before touchdown, the groundspeed should be reduced to a minimum
*FIRE* (Engine 1) or *FIRE* (Engine 2) Caution Conditions/Indications: Procedure: (OAFB CASPL - B - L)
*Conditions/Indications* - Over-temperature in engine compartment - Warning bell will be activated *Procedure* *IN FLIGHT* 1. OEI flight condition - Establish 2. Airspeed - Reduce if IAS is exceeding 100 kts 3. FIRE sw (affected engine) - Raise guard, press *NOTE:* Affected engine will shut down automatically, ACTIVE indicator light, BOT 1 legend (both EMER OFF SW pnl), and F VALVE CL caution indication (CAD) come on. FIRE legend remains on as long as overheat condition exists. 4. BOT 1/BOT 2 pb - Press; bottle 1 activated - EXT indicator light comes on (EMER OFF SW pnl) *NOTE:* Extinguisher bottle will begin discharging when N1t 50%. After discharge of bottle contents, BOT 1 legend and EXT indicator light go off; BOT 2pb legend comes on. 5. Clock stop watch - Start (after BOT 1 legend and EXT indicator light go off (EMER OFF SW pnl) 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 pb - Press; bottle 2 activated - EXT indicator light comes on (EMER OFF SW pnl) If FIRE warning remains on: 11. LAND IMMEDIATELY
Engine Overspeed - Governor Failure Conditions/Indications: Procedure: (CVT - ATL)
*Conditions/Indications* - ROTOR RPM warning light may come on - VAR NR caution indication may come on - ENG SPLIT caution indications may come on - NRO and both N2 increase *Affected engine:* - Torque, N1 and TOT increase Normal engine: - Torque and TOT may decrease *Procedure* 1. Collective lever - Raise as necessary to maintain N2 and NRO within limits 2. VAR NR system NORM/MAN sw - Check MAN 3. N2 TRIM sw - 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 towards 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 twist grip. *After landing:* Rotate twist grip (affected engine) towards IDLE before lowering the collective lever to full-down position (maintain NRO and N2 within limits). *CAUTION:* N2 RPM OVER *123.1%* MAY RESULT IN AN ENGINE OVERSPEED TRIP (AUTOMATIC SHUTDOWN).
Single Engine Failure - Flight Conditions/Indications: Procedure: (ORASL)
*Conditions/Indications* - Slight jerk in the yaw axis, nose left - Possible change in noise level *Affected engine:* - ENG FAIL warning light and warning gong on - ENG SPLIT caution indication - ENG OIL P caution indication - FUEL PRESS caution indication - GEN DISCON caution indication - OVSP FAIL caution indication - VAR NR caution indication - NORM/MAN pb (main switch panel) MAN legend comes on (yellow) - Instruments indicate power loss *NOTE:* The VAR NR system will revert to the manual mode automatically. *Procedure* 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
*XMSN OIL PRESS* Warning Conditions/Indications: Procedure: (PL-L)
*Conditions/Indications* - XMSN oil pressure is below minimum (Transmission oil pressure indication *1 bar* or less) - Warning gong will be activated *NOTE:* XMSN OIL PRESS warning light may come on momentarily during extreme side slip, sidewards flight, crosswind hover or slope operations. *Procedure* 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 NOTE Descend with minimum power
Engine Underspeed - Governor Failure Conditions/Indications: Procedure: (OBVAT - TL - S)
*Conditions/Indications:* - ROTOR RPM warning light may come on - VAR NR caution indication may come on - ENG SPLIT caution indications may come on *Affected engine:* - Torque, N1 and TOT decrease - N2 may decrease *Normal engine:* - NRO and N2 may decrease *Procedure* 1. OEI flight condition - Establish 2. Bleed air consumers - Off 3. VAR NR system NORM/MAN pb - Check MAN 4. Affected engine - Identify 5. N2 TRIM sw - Compensate N2/NRO drop and try to match torque *If torque match is not possible:* 6. Twist grip (affected engine) - Release stop plate and rotate towards FLIGHT until N2 and NRO stabilize in normal range and FLI needles match 7. LAND AS SOON AS PRACTICABLE *If no residual torque (affected engine) is available:* 8. Single engine emergency shutdown - Perform *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 twist grip. *After landing:* Rotate twist grip (affected engine) towards IDLE before lowering the collective lever to full-down position (maintain NRO and N2 within limits). *CAUTION:* N2 RPM OVER 123.1% MAY RESULT IN AN ENGINE OVERSPEED TRIP (AUTOMATIC SHUTDOWN).
Single Engine Failure - Hover OGE Conditions/Indications: Procedure: (CA - LCAS) (CA - CRACASL)
*Conditions/Indications:* - Slight jerk in the yaw axis, nose left - Possible change in noise level *Affected engine:* - ENG FAIL warning light and warning gong on - ENG SPLIT caution indication - ENG OIL P caution indication - FUEL PRESS caution indication - GEN DISCON caution indication - OVSP FAIL caution indication - VAR NR caution indication - NORM/MAN pb (main switch panel) MAN legend comes on (yellow) - Instruments indicate power loss *NOTE:* The VAR NR system will revert to the manual mode automatically. *Procedure* 1. Collective lever - Adjust to maintain rotor RPM 2. Airspeed - Increase if 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 emergency shutdown - Perform *TRANSITION TO OEI - FLIGHT* 3. Collective lever - Adjust to OEI-limits or below 4. Rotor speed - Trim to maximum 5. Airspeed - Gain, 65 KIAS (VY) *After reaching safe altitude:* 6. Collective lever - Reduce to OEI MCP or below 7. Affected engine - Identify 8. Single engine emergency shutdown - Perform 9. LAND AS SOON AS PRACTICABLE
*ROTOR RPM* Warning Conditions/Indications: (NRO High/NRO Low) Procedure: (RC)
*Conditions/Indications:* NRO low (95% or less) - steady light - Audio signal - low-pitch beeping tone NRO high (106% or above) - flashing light - warning gong NRO high (110% or above) - flashing light - steady high-pitch tone *Procedure:* 1. Rotor RPM indicator - Check 2. Collective lever - Adjust as necessary to maintain NRO within normal range
*ENG 1 FAIL* or *ENG 2 FAIL* Warning Conditions/Indications: Procedure: (OASL)
*Conditions/Indications:* Respective N1-RPM below threshold value. *Procedure:* 1. OEI flight condition - Establish 2. Affected engine - Identify 3. Single engine emergency shutdown - Perform 4. LAND AS SOON AS PRACTICABLE
*AP* Warning light + *AP1 & AP2* Cautions Conditions/Indications: Procedure: (FL)
*Conditions/Indications:* Second disengagement or failure of an autopilot module. Both autopilot modules are lost. *Procedure* 1. Flying controls - Hands-on 2. LAND AS SOON AS PRACTICABLE
Single Engine Emergency Shutdown - Procedure: (TR - BB)
*NOTE:* The VAR NR system will revert to the manual mode automatically. *NOTE:*Before performing an inflight single engine emergency shutdown, determine if the situation will allow for OEI flight. *NOTE:*Make certain that: - the controls of the affected engine are selected, and - the collective lever is adjusted to maintain the normal engine within the OEI limits *Procedure* 1. Twist grip (affected engine) - Rotate slowly to IDLE, check indications, then to OFF 2. Rotor speed - Trim to maximum Bleed air heating (if installed) will be shut down automatically, however, depending on power margin of the remaining engine, may be re-engaged as follows: 3. BLD HTG EMER/NORM sw - EMER 4. BLD HTG rheostat - ON
Autorotation - Procedure: (CAD - F - F - HCB)
*Procedure* 1. Collective lever - Reduce to maintain NRO within limits 2. Airspeed - 75 KIAS recommended *NOTE:* Maximum range airspeed . . . . . . . . . . . . . . . . . . . 90 KIAS Minimum rate-of-descent airspeed . . . . . . . . . . 60 KIAS 3. Double engine emergency shutdown - Perform *AT APPROXIMATELY 100 FT AGL:* 4. Flare attitude - Establish (approx. 15 - 20°) to reduce forward speed and rate of descent; control NRO *AT APPROXIMATELY 8 - 12 FT AGL:* 5. Flare attitude - Reduce to approx. 7° 6. Heading - Maintain 7. Collective lever - Raise to stop descent and cushion landing 8. BAT MSTR sw - OFF *NOTE:* The appropriate values must be adjusted according to prevailing conditions of gross mass, wind and terrain.
What is the definition of Land Immediately?
The urgency of landing is paramount. Primary consideration is to assure survival of the occupants. Landing in water, trees or other unsafe areas should be considered only as a last resort.
