(2)
Connect electrical power to airplane and close GND PWR switch on panel P5. Energize No. 1 and No. 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, AUX VERT GYRO (ALT), and F/O'S ADI on panel P6; VERT GYRO-1, VERT GYRO-1 (ALT), AUX VERT GYRO (STBY ALT), CAPT'S ADI, AUX VERT GYRO, 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 assembly 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 CAPT ON AUX position and repeat steps (2) thru (5) using auxiliary gyro and captain's ADI.
(8)
Place VERTICAL GYRO transfer switch in F/O ON AUX position and repeat steps (2) thru
(5) using auxiliary gyro and first officer'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.
(4)
Place VERTICAL GYRO switch in NORMAL position.
TEST 1 2 3 4 5 6 7 VG TRANSFER SWITCH POSITION NORMAL NORMAL NORMAL NORMAL NORMAL CAPT ON AUX (STBY ALT) F/O ON AUX OPEN CIRCUIT BREAKER VERT GYRO-1 CAPT ADI VERT GYRO -2 F/O’S ADI AUX VERT GYRO AUX VERT GYRO AUX VERT GYRO GYRO FLAG APPEARS ON ADI Captain’s Captain’s F/O’S F/O’S Nowhere Captains F/O’S AUX VG INOP ANNUNCIATOR Out of view Out of View Out of View Out of View In View In View In View
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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.
VERTICAL REPOSITION
GYRO VERTICAL
SWITCH GYRO FLAG APPEARS
TEST POSITION CIRCUIT BREAKER SWITCH TO ON ADI
1 NORMAL INSTR TRANS CAPT ON AUX Captain's F/O ON AUX F/O's
2 CAPT ON AUX INSTR TRANS NORMAL Captain's F/O ON AUX Captain's & F/O's
3 F/O ON AUX INSTR TRANS NORMAL F/O's CAPT ON AUX Captain's & F/O's
E. Remove electrical power from airplane.
3. System Test
A. Equipment and Materials
(1) Calibrated tilt tables (3 required if an auxiliary vertical gyro is installed)
B. Prepare for System Test
(1)
Remove vertical gyros from mountings and install on calibrated tilt tables (oriented as installed in airplanes).
(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 No. 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, AUX VERT GYRO (ALT), and F/O'S ADI on panel P6; VERT GYRO-1, VERT GYRO-1 (ALT), AUX VERT GYRO (STBY ALT), CAPT'S ADI, AUX VERT GYRO, and INSTR TRANS on panel P18.
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