TM  1-1520-240-10            9-1-1 CHAPTER  9 EMERGENCY PROCEDURES SECTION  I.  HELICOPTER SYSTEMS 9-1-1.  Helicopter Systems. This section describes helicopter systems emergencies which ,may reasonably be expected to occur and pres- ents the procedures to be followed. Emergency opera- tion of mission equipment is contained in this chapter, insofar as its use affect safety of flight. Emergency proce- dures  are  given  in  checklist  form  when  applicable.  A condensed version of these procedures is included in TM 55-1520–240-10-CL. Refer to figure 9-1-1 and 9-1-2 for emergency equipment, exits, and entrance. 9-1-2.  Immediate Action Emergency Checks. NOTE The urgency of certain emergencies requires immediate and instinctive action by the pilot. The  most  important  single  consideration  is helicopter  control.  All  other  procedures  are subordinate  to  this  requirement.  The  MAS- TER  CAUTION  should  be  reset  after  each malfunction to allow systems to respond to subsequent malfunctions. When appropriate, a check of the affected PDP for open circuit breakers  should  be  accomplished,  in  some cases this may minimize or eliminate the em- ergency. An example of this would be an ap- parent failure of an instrument, whereas re- setting the circuit breaker restores operation. If  time  permits  during  a  critical  emergency, jettison external loads, and lock shoulder har- nesses. Those steps that must be performed immediately in an emergency  procedure  are  underlined.  These  steps must  be  performed  without  reference  to  the  checklist (CL). When the situation permits, non–underlined steps will be accomplished with the use of the CL. 9-1-3.  Definition of Emergency Terms. For   the   purpose   of   standardization,   the   following definitions shall apply: a.  The  term  LAND  AS  SOON  AS  POSSIBLE  is defined as executing a landing to the nearest suitable landing  area.  (e.g.,  open  field)  without  delay.  (  the primary   consideration   is   to   assure   the   survival   of occupants.) b.  The term LAND AS SOON AS PRACTICABLE is defined as executing a landing at the nearest suitable airfield/heliport. c.  The term AUTOROTATE is defined as adjusting the flight controls as necessary to establish an autorota- tional descent and landing. 1.   Thrust  control  —  Adjust  as  required  to maintain RRP 2.   Pedals — Adjust as required. 3.   Cyclic — Adjust as required. d.  The term EMER ENG SHUTDOWN is defined as engine  shutdown  without  delay.  Engine  shutdown  in flight  is  usually  not  an  immediate  action  unless  a  fire exists. Before executing an engine shutdown, identify the affected   engine   by   checking   indications   of   torque, RRPM. N1, PTIT, engine oil pressure and ^714A   ENG FAIL Caution. CAUTION When in-flight shutdown of a malfunctioning engine  is  anticipated  positive  identification of  the  malfunctioning  engine  must  be  ac- complished  to  avoid  shutting  down  the wrong engine. 1.   ENG COND lever — STOP. 2.   FIRE PULL handle — PULL (engine fire only). 3.   AGENT DISCH switch — As required. (en- gine fire only). e.  The  term  ABORT  START  is  defined  as  engine shutdown to prevent PTIT from exceding limits orwhe- never abnormal operation is indicated. If high PTIT was indicated,  the  engine  must  be  monitered  to  decrease PTIT below 260_C. 1.   ENG COND lever — STOP. 2.   ENG START switch — MTR (if high PTIT is indicated). NOTE If a second engine start is to be attempted, wait at least 15 seconds after the N1 tacome- ter  indicates  zero  before  attempting  start. This will allow sufficient time for fuel to drain from the combustion chamber. 9-1-4.  Emergency Warning Signals and Exits. The  helicopter  is  equipped  with  an  emergency  troop alarm and jump light system. The following standard sig-