757 AMM 飞机维护手册 时间限制/维护检查(39)

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 S 862-060
 (3)  757-200; Open the circuit breaker C4086, on the P34 Panel:
 NOTE:____ This will put the shut-off valve located on the top of each toilet tank to the closed position. With this valve closed, it will prevent toilet liquid flow-back during the test.
 (a)  34A3(A), FILL CONT LAV
 S 862-004
 (4)  757-200 AIRPLANES; Make sure the fill/overflow valve handle on the potable water he system service panel is CLOSED.
 S 862-005
 (5)  Open all internal compartment doors.
 S 862-006
 (6)  Make sure that all these circuit breakers on the panel, P11, are closed:
 (a) (b)  11B14, CABIN ALT/PRESS MNL OR CABIN ALTITUDE CONTROL MANUAL11B15, CABIN ALT/PRESS SEL OR CABIN ALTITUDE CONTROL SELECT
 S 862-007
 (7)  Make sure the outflow valve position indicator on the pilot's overhead panel, P5, shows that the valve is fully open. If it is not open, do the steps that follow: (a) Move the CABIN ALTITUDE CONTROL MODE SELECT switch on the pilot's overhead panel, P5, to MAN.

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757
MAINTENANCE MANUAL

HOW TO USE CURVE:
EXAMPLE: (A)  ASSUME TEST RESULTS IN AVERAGE TEMPERATURE OF 80`F, AMBIENT PRESSURE OF 14.15 PSIA, AND TIME THREE MINUTES.
(B)  FROM CURVES BELOW: TEMPERATURE CORRECTION FACTOR IS 0.99 AND PRESSURE CORRECTION FACTOR IS 1.02. THE PRODUCT OF THE TWO FACTORS IS 1.01. THUS, TIME CORRECTED TO AN AMBIENT PRESSURE OF 14.7 PSIA INITIAL CABIN
.
.TEMPERATURE OF 70`F AND 4.0 PSIG DIFFERENTIAL = 3 - 1.01 = 2.97 MINUTES.

16
160
14
120
CABIN TEMPERATURE - `F
80
12
10
40
8
0
AMBIENT PRESSURE - PSIA
6-40 4-80
CORRECTION FACTOR
CORRECTION FACTOR TO BE APPLIED TO BLEED DOWN TIME WHEN AMBIENT PRESSURE DOES NOT EQUAL 14.7 PSIA AND/OR CABIN TEMPERATURE DOES NOT EQUAL 70`F.
Pressure Leakage Test Correction Factor
Figure 202

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A 757 MAINTENANCE MANUAL
4.5
4.0

DIFFERENTIAL PRESSURE - PSID

3.5
3.0
2.5
2.0
1.5
TIME - SECONDS 757-200
NOTE: 2.0 PSID IS THE RECOMMENDED MININUM TEST POINT.
Pressure Leakage Rate Check Chart
Figure 203 (Sheet 1)

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MAINTENANCE MANUAL

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Pressure Leakage Rate Chart
Figure 203 (Sheet 2)

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MAINTENANCE MANUAL

 (b)  Move the CABIN ALTITUDE CONTROL MANUAL switch on the panel, P5 to CLIMB. Put the switch in the center (between CLIMB and DESCEND) when the VALVE indicator shows that the outflow valve is fully open.
 NOTE: The valve will be fully open in approximately 25
____
 seconds.

 S 792-008
 CAUTION: MAKE SURE THAT ALL OF THE PITOT STATIC SYSTEM IS THERE AND IT
_______ HAS BEEN LEAK TESTED. ALSO, REMOVE EQUIPMENT THAT IS CONNECTED TO THE PITOT STATIC SYSTEM BEFORE YOU START THE FUSELAGE LEAKAGE TEST. DAMAGE TO EQUIPMENT CAN OCCUR IF THE PITOT STATIC SYSTEM IS NOT COMPLETE AND PRESSURE TIGHT.
　
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