34-11-00
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747-400 MAINTENANCE MANUAL
(b) Install all of the drain assemblies and quick-disconnects.
S 433-229
(15) In the electrical and electronics compartment, install all of the drain assemblies (eight drains) on the pitot-static system:
(a)
Remove the plugs from the drain lines.
(b)
Install all of the drain assemblies and quick-disconnects.
S 433-230
(16) At STA 400 on the left and right sides, install all of the drain assemblies (ten drains) on pitot-static system:
(a)
Remove the plugs from the drain lines.
(b)
Install all of the drain assemblies and quick-disconnects.
S 433-231
(17) At STA 740 on the left side of the forward cargo compartment, install all of the drain assemblies (three drains) on the pitot-static system:
(a)
Remove the plugs from the drain lines.
(b)
Install all of the drain assemblies and quick-disconnects.
S 433-232
(18) At STA 1980 on the right side of the bulk cargo compartment, install all of the drain assemblies (two drains) on the pitot-static system:
(a)
Remove the plugs from the drain lines.
(b)
Install all of the drain assemblies and quick-disconnects.
S 793-233
(19) Perform a leakage test on the pitot-static systems (Ref 34-11-00/501).
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34-11-00
ALL ú ú 05 Page 339 ú Jun 10/95
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747-400 MAINTENANCE MANUAL
PITOT-STATIC SYSTEM - ADJUSTMENT/TEST
_____________________________________
1. General
_______
WARNING: MAKE SURE THE ATC TRANSPONDERS ARE NOT IN AN ALTITUDE REPORTING
_______
MODE WHEN YOU SIMULATE ALTITUDE. IF YOU DO NOT, YOU CAN
ACCIDENTALLY CAUSE FALSE TCAS TARGETS.
A. Make sure the ATC transponders are not in an altitude reporting mode.
B. This subject gives two tasks. The first task is a high range test. The second is a low range test. These leak tests pressurize the system or systems that are tested. For each test, you get measurements and compare them to the specifications for the system or systems.
C. The leak check for the Pitot-Static system includes these systems:
(1)
The Pitot-Static System Full-Range Leak Test
(2)
The Captain's Pitot System Leak Test
(3)
The First Officer's Pitot System Leak Test
(4)
The Auxiliary No. 1 Pitot System Leak Test
(5)
The Auxiliary No. 2 Pitot System Leak Test
(6)
The Captain's Static System Leak Test (Full-Range)
(7)
The First Officer's Static System Leak Test (Full-Range)
(8)
The Auxiliary No. 1 Static System Leak Test (Full-Range)
(9)
The Auxiliary No. 2 Static System Leak Test (Full-Range)
(10)
The Alternate Static System Leak Test (Full-Range)
(11)
The Left Dedicated Static System Leak Test
(12)
The Right Dedicated Static System Leak Test
(13)
The Captain's Static System Leak Test (Low-Range)
(14)
The First Officer's Static System Leak Test (Low-Range)
(15)
The Auxiliary No. 1 Static System Leak Test (Low-Range)
(16)
The Auxiliary No. 2 Static System Leak Test (Low-Range)
(17)
The Alternate Static System Leak Test (Low-Range)
(18)
The Static System Cross-Manifold Test.
D. The full-range leak test makes sure that the pitot-static system does not leak at an altitude of 25,000 feet and an airspeed of 300 knots. You can do a test of each pitot system and each static system as an isolated unit. You must not apply too much differential pressure when you test one of the static systems. You must pressurize the pitot system to prevent too much differential pressure during a full-range static system leak test.
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