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ATTITUDE REFERENCE SYSTEM -ADJUSTMENT/TEST
EFFECTIVITY
GJ ALL EXCEPT B-2509 and B-2510
1. General
A. The following procedures describe two methods for testing the attitude reference systems in the airplane. The first procedure is an operational test in which only onboard equipment is used. The second procedure is a system test using the tilt tables to check system tolerances.
B. The system test should be made prior to or concurrent with the adjustment/test of autopilot, weather radar, flight director, and navigation warning systems. If these systems are to be tested, performing those portions of test that require use of tilt table will save setup time.
2. Operational Test
A. Prepare for Operational Test
(1)
Remove mounting bolts from vertical gyros.
(2)
Connect electrical power to airplane and close GND PWR switch on panel P5. Energize No. 1 and 2 electronics buses by closing ac and dc circuit breakers on panel P6 and placing master switches in ON position.
(3)
Check that following circuit breakers are closed: VERT GYRO-2, F/O HORIZ (ALT), INST XFMR-2, and INV CONT on panel P6; VERT GYRO-1, CAPT'S HORIZ (ALT), INST XFMR-1, CAPT'S HORIZ, F/O's HORIZ, and INSTR TRANS on panel P18.
B. Roll and Pitch Servo Test
(1)
Place VERTICAL GYRO transfer switch in NORMAL position. Check that both ADI's indicate airplane roll and pitch attitude 1 minute after power is applied.
(2)
Tilt vertical gyro No. 1 until captain's ADI indicates 10 degrees pitch down (attitude assembly moves toward top of indicator).
NOTE: ADI should follow displacements of vertical gyro smoothly with no sluggishness or overshoot.
(3)
Tilt vertical gyro No. 1 until captain's ADI indicates 10 degrees pitch up.
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(4)
Tilt vertical gyro No. 1 until captain's ADI indicates 20 degrees right roll (attitude tape rotates counterclockwise).
(5)
Tilt vertical gyro No. 1 until captain's ADI indicates 20 degrees left roll.
(6)
Repeat steps (2) thru (5) using vertical gyro No. 2 and first officer's ADI.
(7)
Place VERTICAL GYRO transfer switch in BOTH ON 2 position and repeat steps (2) thru (5) using vertical gyro No. 2 and captain's ADI.
(8)
Place VERTICAL GYRO transfer switch in BOTH ON 1 position and repeat steps (2) thru (5) using vertical gyro No. 1 and F/O's ADI.
(9)
Return vertical gyros to level and install mounting bolts.
C. Attitude Warning Flag Circuit Test
(1)
Check warning circuits as tabulated below.
(2)
Circuit breakers shall be opened one at a time and closed at completion of each test.
(3)
Check that flag appears when breaker is opened, disappears when breaker is closed.
TEST VG TRANSFER SWITCH POSITION OPEN CIRCUIT BREAKER GYRO FLAG APPEARS ON ADI
1 NORMAL VERT GYRO-1 Captain’s
2 NORMAL CAPT HORIZ Captain’s
3 NORMAL VERT GYRO-2 F/O’s
4 NORMAL F/O HORIZ F/O’s
5 BOTH ON 2 VERT GYRO-2 Captain’s *
F/O’s
6 BOTH ON 2 CAPT’S HORIZ (ALT Captain’s
7 BOTH ON 2 F/O’S HORIZ Captain’s &
F/O’s
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VG TRANSFER GYRO FLAG
SWITCH OPEN APPEARS
TEST POSITION CIRCUIT BREAKER ON ADI
8
BOTH ON 2 INST XFMR-2 Captain’s
9
BOTH ON 1 VERT GYRO-1 Captain’s & F/O’S 10 BOTH ON 1 F/O’S HORIZ (ALT) F/O’s 中国航空网 www.aero.cn 航空翻译 www.aviation.cn 本文链接地址：737 AMM 飞机维护手册 导航 NAVIGATION 1(77)
