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发表于 2012-9-27 12:04:10
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来自： 中国山东青岛
Re:弱弱的问下737NG有关于APU启动的步骤在AMM里能找到吗 具体
TASK 49-11-00-860-801
3. APU Starting And Operation(Figure 202)
A. General
(1) It is recommended that you do an APU starting and operation procedure a minimum of one time each month if the airplane has not operated and you did not do the APU preservation procedure during this time. You must operate the APU for a minimum of five minutes under a “no-load” condition and then do the APU shutdown procedure. In most conditions, the operation of the APU during this monthly interval will prevent internal/external corrosion and damage to the fuel and oil seals/components.
D. Procedure
SUBTASK 49-11-00-860-224
WARNING: IF A REFUELING OPERATION IS IN THE AREA, OBEY THE WARNINGS AND CAUTIONS IN THE PRESSURE REFUEL PROCEDURE BEFORE YOU DO THE APU STARTING AND OPERATION PROCEDURE. IF YOU DO NOT OBEY THE WARNINGS AND CAUTIONS, INJURY TO PERSONS CAN OCCUR.
(1) If there is a refueling operation in the area, make sure you obey the WARNINGs and CAUTIONs in the pressure refuel procedure (Pressure Refuel Procedure, TASK 12-11-00-650-802).
SUBTASK 49-11-00-210-013
CAUTION: DO NOT TRY AN APU START IF THERE IS ICE AROUND THE HINGED FLAP OF THE VORTEX GENERATOR. THE MOTOR FOR THE INLET DOOR ACTUATOR CAN BE DAMAGED IF THERE IS ICE.
(2) Make sure there is no ice around the hinged flap of the vortex generator for the air inlet door.
(a) If you find ice, do this task: Cold Weather Maintenance Procedure, TASK 12-33-01-600-802.
SUBTASK 49-11-00-210-014
(3) Make sure there are no loose objects near the air inlet door.
NOTE: Loose objects can go into the air inlet plenum and compressor inlet plenum of the APU during the APU operation.
SUBTASK 49-11-00-860-062
(4) Make sure the BAT switch [1] on the P5 forward overhead panel is set to the ON position.
SUBTASK 49-11-00-210-015
WARNING: MAKE SURE THERE IS SUFFICIENT FUEL IN THE NO. 1 FUEL TANK TO KEEP THE BOOST PUMP INLETS COVERED DURING THE SCHEDULED APU OPERATION. DO NOT OPERATE BOOST PUMPS IN A DRY CONDITION WITH FLAMMABLE VAPORS IN THE TANK. FUEL VAPORS IN THE TANK MAY IGNITE AND CAUSE A FIRE OR EXPLOSION.
(5) Look at the fuel quantity display on the P2 center instrument panel for the No. 1 fuel tank.
NOTE: A minimum of 500 pounds (227 kilograms) of fuel must be in the No. 1 fuel tank.
SUBTASK 49-11-00-860-018
(6) Make sure that these circuit breakers are closed:
SUBTASK 49-11-00-860-021
(8) For a standard operation (ac power) start of the APU:
NOTE: A dc start of the APU will occur automatically if there is a problem with an ac start regardless of the position of the circuit breaker APU START CONV.
(a) Make sure that this circuit breaker is closed:
Power Distribution Panel Number 1, P91
(9) Make sure these switches on the P5 forward overhead panel are set correctly:
(a) Set the APU master switch [16] to the OFF position.
(b) Set the APU BLEED switch [8] to the OFF position.
(c) Set the L PACK and R PACK switches [4], [5] to the OFF position.
(d) Set the ISOLATION VALVE switch [6] to the CLOSE position.
(e) Make sure the STANDBY POWER switch [10] is in the AUTO position.
(f) Make sure the BUS TRANS switch [11] is in the AUTO position.
(g) Momentarily set one of the two APU GEN switches [13] to the ON position and then release.
NOTE: It is necessary to set one of the two APU GEN switches [13] to the ON position before an APU start. This step will make sure that the ac indications on the P5-13 panel for voltage and frequency are available before you set the APU generator on line.
(h) Obey these fuel pump limitations during the pump operation:
1) The fuel boost pumps in the No. 1 or No. 2 fuel tanks should only be operated if there is a person in the flight compartment to continuously monitor the fuel quantity and the LOW PRESSURE indication of the No. 1 and No. 2 fuel pumps when the quantity of fuel is less the 250 pounds (114 kilograms).
2) The center tank fuel pump switches should only be positioned ON if there is a person in the flight compartment to continuously monitor the fuel quantity and the LOW PRESSURE indication of the center tank fuel pump.
3) Immediately set the applicable fuel pump switch(es) to OFF if the LOW PRESSURE light comes on and stays on.
WARNING: DO NOT OPERATE A FUEL PUMP IF THE LOW PRESSURE LIGHT COMES ON AND STAYS ON. THIS CONDITION CAN CAUSE THE IGNITION OF THE FUEL FUMES IN THE FUEL TANK. A FIRE OR AN EXPLOSION CAN CAUSE INJURIES TO PERSONNEL AND DAMAGE TO EQUIPMENT.
(i) Set the No. 1 AFT FUEL PUMP switch [17] or No. 1 FWD FUEL PUMP switch [17] to the ON position.
1) Look at the fuel quantity display on the P2 center instrument panel for the No. 1, No. 2 or center fuel tank.
2) Make sure there is sufficient fuel in the No. 1 or No. 2 or center fuel tank for continuous APU operation.
3) If you operate the center fuel tank pump, you must have a person in the flight compartment to continuously monitor the fuel quantity and the LOW PRESSURE indication of the center fuel tank pump.
NOTE: A minimum of 500 pounds (227 kilograms) of fuel is necessary to operate the APU for one hour. If continuous APU operation is more than one hour, calculate the quantity of fuel necessary to operate the APU as follows: multiply the number of hours by 500 pounds (227 kilograms) of fuel.
4) If the quantity of fuel in the No. 1 or No. 2 fuel tank is more than 250 pounds (114 kilograms), or center tank is more than 1000 pounds (454 kilograms), do one of these two alternatives:
a) An observer is not required in the flight compartment if you do not operate the center fuel tank pump and you calculate the time that you must go back to the flight compartment when the quantity of fuel for the No.1 or No.2 fuel tank is less than these limits.
b) An observer is in the flight compartment to continuously monitor the fuel quantity and the LOW PRESSURE lights.
5) If the quantity of fuel in the No. 1 or No. 2 fuel tank is less than 250 pounds (114 kilograms) or center tank is less than 1000 pounds (454 kilograms), do these steps:
a) To operate any of the fuel pumps, you must have an observer in the flight compartment to continuously monitor the fuel quantity and the LOW PRESSURE lights.
b) Immediately set the applicable fuel pump switch(es) to OFF if the LOW PRESSURE light comes on and stays on.
(j) Set the AC selector switch [3] to the APU GEN position.
SUBTASK 49-11-00-710-004
(10) Do a check of the fire detection system for the APU:
(a) Move and hold the TEST switch [21] on the P8 aft electronic panel to the OVHT/FIRE position.
1) Make sure these lights come on:
a) The APU fire switch light (red) [19] on the P8 aft electronic panel.
b) The L and R MASTER CAUTION lights (amber) [27], [24] on the P7 glareshield panel.
c) The L and R FIRE WARN lights (red) [22], [23] on the P7 glareshield panel.
d) The OVHT/DET annunciator light (amber) [25] on the P7 glareshield panel.
2) Make sure the fire alarm bell in the aural warning module, M315, comes on.
NOTE: The aural warning module, M315, is in the flight compartment.
3) Make sure the APU remote fire light (red) [29] in the right main wheel well flashes on and off continuously.
4) Make sure the APU remote warning horn [28] in the right main wheel well comes on.
(b) Release the TEST switch [21].
1) Make sure these lights go off:
a) The APU fire switch light (red) [19] on the P8 aft electronic panel.
b) The L and R MASTER CAUTION lights (amber) [27], [24] on the P7 glareshield panel.
c) The L and R FIRE WARN lights (red) [22], [23] on the P7 glareshield panel.
d) The OVHT/DET annunciator light (amber) [25] on the P7 glareshield panel.
2) Make sure the fire alarm bell in the aural warning module, M315, stops (no sound).
3) Make sure the APU remote fire light (red) [29] in the right main wheel well goes off.
4) Make sure the APU remote warning horn [28] in the right main wheel well stops (no sound).
(c) Move and hold the TEST switch [21] to the FAULT/INOP position.
1) Make sure these lights come on:
a) The FAULT light (amber) [34] on the P8 aft electronic panel.
b) The APU DET INOP light (amber) [18] on the P8 aft electronic panel.
c) The L and R MASTER CAUTION lights (amber) [27], [24] on the P7 glareshield panel.
d) The OVHT/DET annunciator light (amber) [25] on the P7 glareshield panel.
(d) Release the TEST switch [21].
1) Make sure these lights go off:
a) The FAULT light (amber) [34] on the P8 aft electronic panel.
b) The APU DET INOP light (amber) [18] on the P8 aft electronic panel.
c) The L and R MASTER CAUTION lights (amber) [27], [24] on the P7 glareshield panel.
d) The OVHT/DET annunciator light (amber) [25] on the P7 glareshield panel.
(e) Move and hold the EXT TEST switch [20] on the P8 aft electronic panel to the 1 position.
1) Make sure the APU, L and R lights come on.
(f) Move and hold the EXT TEST switch [20] to the 2 position.
1) Make sure the APU, L and R lights come on.
(g) Release the EXT TEST switch [20].
1) Make sure the APU, L and R lights go off.
SUBTASK 49-11-00-280-002
CAUTION: AN UNDETECTED FIRE COULD OCCUR IN THE APU COMPARTMENT WITH THE APU COWL DOOR OPEN. THE APU FIRE DETECTION SYSTEM MAY NOT SENSE A SMALL FIRE AND MOST OF THE FIRE EXTINGUISHING AGENT WILL GO OUT FROM THE OPEN APU COWL DOOR. DAMAGE TO THE APU AND THE AIRPLANE CAN OCCUR.
(11) Make sure there is an observer near the APU compartment to watch for a fire if the APU cowl door is open during the APU operation.
NOTE: The observer should be in voice contact with aircraft personnel to report if a fire condition occurs. Aircraft personnel can do the APU emergency shutdown procedure and other corrective actions (include the use of fire extinguishers).
SUBTASK 49-11-00-860-023
(12) Set the APU master switch [16] to the START position and release it to the ON position.
NOTE: It is recommended that you obey the start duty cycle when you try to start the APU. The start duty cycle for the APU is three times in a 15 minute interval. If you do three successful or unsuccessful start cycles in a 15 minute interval, it is recommended that you wait 15 minutes after the third start cycle for the power electronics to cool. This 15 minute interval is necessary to cool the temperature of the power electronics in the start power unit and/or start converter unit. If the duty cycle is exceeded and the temperature limit is reached, the APU will not start.
SUBTASK 49-11-00-860-024
(13) Make sure the LOW OIL PRESSURE light [15] comes on.
SUBTASK 49-11-00-860-026
(14) Make sure the air inlet door opens.
SUBTASK 49-11-00-860-027
(15) Monitor these indications on the P5 forward overhead panel:
(a) Make sure the LOW OIL PRESSURE light [15] goes off before the APU engine speed is 95%.
(b) Look at the CPS FREQ display [2].
NOTE: With no load applied to the APU, the CPS FREQ display must become stable at 395-405 CPS when the APU engine speed is 100%.
NOTE: The time necessary for an APU start must be less than 90 seconds.
(c) Make sure the APU GEN OFF BUS light [12] comes on when the APU engine speed is 100%.
NOTE: When the APU GEN OFF BUS light comes on or the CPS FREQ display is stable at 395-405 CPS, the APU is prepared for pneumatic and/or electrical loads. |
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