Immediate Action Emergency Actions
NOTE
The urgency of certain emergencies requires immediate and instinctive actions by the pilot. The most important single consideration is helicopter control. All procedures are subordinate to this requirement. If time permits during a critical emergency, transmit MAYDAY call, set transponder to emergency, turn the ELT ON, and lock the shoulder harness.
Land as soon as possible
Land without delay to the nearest suitable area (i.e. open field) in which a safe approach and landing is reasonably assured. (The primary consideration is to ensure the survival of the occupants.
Land as soon as practicable
The landing site and duration of the flight are at the discretion of the pilot. Extended flight beyond the nearest approved landing area is not recommended. (The primary consideration is the urgency of the emergency.)
Warning definition
An operating procedure, practice, etc. which if not correctly followed could result in personal injury or loss of life
Caution definition
An operating procedure, practice, etc. which if not strictly observed could result in damage to, or destruction of equipment.
Note definition
An operating procedure, condition etc. which is essential to highlight.
“Autorotate”
“Emergency Shutdown”
“Engine Failure at a hover”
“Engine Failure - Low Altitude/Airspeed or Cruise.”
Engine malfunctions
“Engine Restart”
Engine malfunctions
Engine Restart - CAUTION
Do not attempt air start above 12,000 feet MSL (TURB OUT TEMP rises too fast to control).
Engine malfunctions
Engine Restart Considerations
After an engine failure in flight, an engine start may be attempted. Because the exact cause of engine failure cannot be determined in flight, the decision to attempt the start will depend on the altitude and time available, rate of desent, potential landing ares and crew assistance available. 52 to 60 KIAS is recommended during the descent. Under ideal conditions, approximately on minute is required to regain powered flight from the time the attempted start is begun. If the decision is made to attempt an in-flight start:
Engine malfunctions
Engine Compressor Stall indications
Engine malfunctions
“Engine Compressor Stall”
Engine malfunctions
Engine Overspeed indications
Engine malfunctions
“Engine Overspeed”
If RPM cannot be controlled by throttle adjustment.
Engine malfunctions
“Engine Underspeed”
If an engine underspeed occurs, the collective must be adjusted downward to maintain rotor RPM within limits. If powered flight with rotor in the green can be accomplished:
An engine underspeed below 90% results in rotor RPM decay below minimum safe limits. Should this occur:
2. Autorotate
Engine malfunctions
“Engine Surges”
a. GOV INCR switch - INCR for maximum RPM
b. Throttle - Adjust to 97% N2
c. Land as soon as possible
If engine surges are not controlled in steps a. and b. above proceed as follows:
a. Autorotate - When over a safe landing area.
b. Emer Shutdown - Accomplish during descent if time permits.
Engine malfunctions
“LOW INLET PRESSURE caution light ON”
Engine malfunctions
“Engine Icing”
NOTE
When anti-ice system is ON, TOT will rise for same power setting.
Engine malfunctions
“If the engine oil pressure is below 50 PSI or the temperature is above 107*C”
NOTE
If engine oil pressure is falling or low and the oil temperature is rising or high, a severe leak may be present.
Engine malfunctions
“Main Drive Shaft Failure”
WARNING
The engine must remain in operation to provide power to the tail rotor. Failure to maintain engine power will result in loss of aircraft control. Adjust throttle as required to maintain engine RPM within normal limits.
Engine malfunctions
Main Drive Shaft Failure - Indications
Transient overspeed of N1 and N2 may occur, but will stabilize.