(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
11 BOTH ON 1 CAPT’S HORIZ Captain’s & F/O’s
12 BOTH ON 1 INST XFMR-1 F/O’S
13 BOTH ON 1 PLACE INVERTER SWITCH F/O’S TO ON
(4) Place VERTICAL GYRO transfer switch in NORMAL position.
D. Vertical Gyro Transfer Relay Monitor Test
(1)
Check transfer relay monitor as tabulated below.
(2)
Open instrument transfer circuit breaker for test and reclose at the completion of each test.
VG TRANSFER REPOSITION VG
SWITCH OPEN TRANSFER FLAG APPEARS
TEST POSITION CIRCUIT BREAKER SWITCH TO ON ADI
1 NORMAL INSTR TRANS BOTH ON 2 BOTH ON 1 Captain’s F/O’s
2 BOTH ON 2 INSTR TRANS NORMAL BOTH ON 1 Captain’s Captain’s & F/O’s
3 BOTH ON 1 INSTR TRANS NORMAL BOTH ON 2 F/O’S Captain’s & F/O’s
E. Remove electrical power from airplane
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3. System Test
A. Equipment and Materials
(1)
Calibrated tilt tables (2 required)
(2)
Gyro extension cables suitably terminated to extend airplane wiring to tilt tables (2 required)
B. Prepare for System Test
(1)
Remove vertical gyros from mountings and install on calibrated tilt tables (oriented as installed in airplane).
(2)
Connect jumper cables between gyros and their respective airplane connector.
(3)
Adjust tilt tables to zero degrees roll and pitch.
(4)
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.
(5)
Check that following circuit breakers are closed: VERT GYRO-2, F/O HORIZ (ALT), INST XFMR-2, F/O's HORIZ and INV CONT on panel P6; VERT GYRO-1, CAPT'S HORIZ (ALT), INST XFMR-1, CAPT'S HORIZ, and INSTR TRANS on panel P18.
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