737 AMM 飞机维护手册 动力装置 POWER PLANT(27)

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WARNING:  DO NOT CONNECT SAFETY LANYARD ASSEMBLY TO ANY TUBING, WIRE HARNESS, ETC. DAMAGE TO ENGINE OR INJURY TO PERSONNEL MAY OCCUR.
(16) On engine run, removal of side cowl panels is recommended (Ref 71-11-11). If side cowl panels are not removed, check that cowl hold open rods are in place and locked by safety pins.
WARNING:  DO NOT OPERATE ENGINE IN REVERSE THRUST MODE WITH ENGINE SIDE COWLS INSTALLED AND OPEN. DAMAGE TO ENGINE OR INJURY TO PERSONNEL MAY OCCUR.
CAUTION:  DURING FREEZING CONDITIONS CHECK FOR ICE IN ENGINE INLET AND EXHAUST AREAS. TURN COMPRESSOR BY HAND AND CHECK FOR FREE ROTATION. IF ICE IS PRESENT, PREHEAT ENGINE WITH AIR HEATER UNTIL COMPRESSOR ROTATES FREELY.
4. New Engine Ignition Check
A. General
(1) Before introducing fuel to a newly installed engine, check ignition system operation.
NOTE: An operating igniter plug produces an easily heard sparking noise.
500 
Jun 20/88  BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  71-09-100 Page 207 

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External Pneumatic and Electrical Connections  500 
71-09-100 Page 208  Figure 202 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  May 15/67 

504  Engine Control Stand and Start Switch Panel 
May 15/79  Figure 203  71-09-100 
Page 209 
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 

B.  Check Engine Ignition
(1)  
Perform engine operation preparations in par. 3.

(2)  
Pull (open) START VALVES circuit breaker on P6 panel.

(3)  
On airplanes with 4 position rotary start switch, with start lever in CUTOFF, rotate engine start switch (forward overhead panel) to FLT. Verify that igniters are not operating  (Fig. 203). On airplanes with 5 position rotary start switch, with start lever in CUTOFF, rotate engine start switch (forward overhead panel) to RT IGN, LT IGN, GRD and FLT. Verify that igniters are not operating (Fig. 203).

WARNING:  THE CURRENTS INVOLVED IN THE IGNITION SYSTEM CAN BE FATAL. DO NOT TOUCH IGNITER PLUGS WHILE THE IGNITION SYSTEM IS OPERATING.
WARNING:  HIGH VOLTAGES WILL BE ENCOUNTERED WHILE FIRING IGNITERS. STAND CLEAR OF TAILPIPE; THERE MAY BE SUFFICIENT AMOUNT OF FUEL VAPOR PRESENT IN THE ENGINE TO CONSTITUTE AN EXPLOSIVE MIXTURE.
(4)  
On airplanes with 4 position rotary start switch, with engine start switch still in FLT position, move start lever to IDLE detent. Verify that igniter sparking sound is heard. On airplanes with 5 position rotary start switch, with engine start switch in FLT position, move start lever to IDLE detent. Verify that igniter sparking sound is heard from both igniters.

(5)  
On airplanes with 4 position rotary start switch, with start lever in IDLE, rotate engine start switch to LOW IGN position. Verify that igniter sparking sound is heard. On airplanes with 5 position rotary start switch, with start lever in IDLE, rotate engine start switch to LT IGN and RI IGN positions. Verify that igniter sparking sound is heard from each igniter at these switch positions.

(6)  
Return engine start switch to OFF position.

(7)  
Push (close) START VALVES circuit breaker.

504 
71-09-100 Page 210  BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  May 15/79 

NOTE:  Above procedure is a general check only. For a detailed ignition system test, refer to Chapter 74, Ignition System.
5.  Motor Engine Procedure
A.  General
(1)  An engine motoring run is required after an unsatisfactory start to clear the engine of trapped fuel and vapors. A motoring run may also be accomplished to bleed and depreserve the engine fuel control and to prime the constant speed drive unit.
May 15/79 71-09-100 Page 210A/210B BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.

B.  Motor Engine
(1)  
Perform Engine Operation Preparations in par. 3.

(2)  
Check that engine start switch is positioned to OFF.

(3)  
Move engine start switch to GRD position and observe N2 rpm increase.

NOTE:  Starter duty cycle for motoring engine is 2 minutes on and 5 minutes off.
CAUTION:  IF THIS SWITCH IS RETURNED TO OFF PRIOR TO END OF MOTORING RUN, IT MUST NOT BE ENGAGED UNTIL 30 SECONDS AFTER ENGINE AND STARTER HAVE STOPPED ROTATING. 
CAUTION:  DO NOT EXCEED STARTER DUTY CYCLE OR DAMAGE TO STARTER MAY RESULT.
(4)  
Check N1 and N2 tachometer indicators for correct direction of rotation.

(5)  
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