(2) Static ground operation is restricted settings of 80 percent N1 RPM and below with crosswinds of 10 to 20 knots or tailwinds of 2 to 5 knots.
(3) Static ground operation is restricted settings of 90 percent N1 RPM and below with crosswinds up to 10 knots or tailwinds up to 2 knots. (Ref. Fig. 501/TASK 71-00-00-991-301) In addition to observing these maximum wind velocities, power assurance runs are restricted if wind velocity variation exceeds 5 knots.
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Preferred Wind Direction and Velocity Limitations For Ground Operations
Figure 501/TASK 71-00-00-991-301
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(4) Position the airplane to obey the preferred wind direction and wind velocity limits for ground operations. (Ref. Fig. 501/TASK 71-00-00-991-301)
(5) Tailwinds, or winds with tailwind components, adversely affect ground operation of engines.
NOTE : ECU logic may prevent engine start with high tailwind.
____
(6) During starting, and at idle or low power settings, tailwinds can cause excessive EGT values.
(7) At power settings of approximately 90 percent N1 RPM an above, tailwinds can cause a fan tip stall. The onset of fan tip stall during stable engine operation can be identified by the following conditions:
(a) The N1 speed (RPM) increases quickly.
(b) The airplane vibration increases.
(c) You can hear a pulsating or a blowtorch type of sound that continuously starts and stops.
NOTE : Whenever a fan tip stall is imminent or has occurred,
____ rapid retardation of the thrust lever will prevent or permit recovery from the stall.
(8) Obey the cowl limitations during ground operations.
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TASK 71-00-00-869-004
Safety Precautions During Engine Ground Operations
1. Reason for the Job
__________________
Self Explanatory
2. Job Set-up Information
______________________
A. Referenced Information -------------------------------------------------------------------------------
REFERENCE DESIGNATION -------------------------------------------------------------------------------71-00-00-991-302 Fig. 502 **ON A/C 001-049, 051-099, 101-149, 201-299,
71-00-00-991-304 Fig. 503
**ON A/C 151-199,
71-00-00-991-304-A Fig. 503A R **ON A/C 301-399, 401-499,
71-00-00-991-304-B Fig. 503B
**ON A/C ALL
71-00-00-991-300 Fig. 504
71-00-00-991-308 Fig. 505
3. Job Set-up
__________
Subtask 71-00-00-869-122
A. Not Applicable
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4. Procedure
_________
Subtask 71-00-00-869-119
A. Safety Precautions During Engine Ground Operations
(1) General
(a) The operation of jet power plants is dangerous. While the engine operates, the following dangerous conditions can occur:
1 There is a very strong suction at the front of the engine that
_ can pull persons and unwanted materials into the air inlet.
2 Very hot, high speed gases go rearward from the turbine
_
exhaust nozzle.
3 The fan exhaust at high thrust has very high speed.
_ 4 When the thrust reverser is extended, the fan exhaust goes
_ forward while the turbine exhaust goes rearward.
5 Exposure to engine noise can damage your hearing.
_
(2) Obey the following precautions about the air inlet
(Ref. Fig. 502/TASK 71-00-00-991-302)
**ON A/C 001-049, 051-099, 101-149, 201-299,
(Ref. Fig. 503/TASK 71-00-00-991-304)
**ON A/C 151-199,
(Ref. Fig. 503A/TASK 71-00-00-991-304-A) R **ON A/C 301-399, 401-499,
(Ref. Fig. 503B/TASK 71-00-00-991-304-B)
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