C. Roll and Pitch Servo Test
(1)
Place VERTICAL GYRO transfer switch in NORMAL position. Check that both ADI's indicate 0.0 ±2 degrees roll and pitch attitude 1 minute after power is applied.
(2)
Adjust each ADI for zero pitch attitude using adjustment screw on lower left corner of ADI's.
(3)
Tilt vertical gyro No. 1 until captain's ADI indicates 10 degrees pitch down (attitude assembly moves toward top of indicator). Check that tilt table indicates 10 ±2 degrees pitch down attitude.
NOTE: ADI should follow displacements of vertical gyro smoothly with no sluggishness or overshoot.
(4)
Tilt vertical gyro No. 1 until captain's ADI indicates 10 degrees pitch up. Check that tilt table indicates 10 ±2 degrees pitch up attitude.
(5)
Tilt vertical gyro No. 1 until captain's ADI indicates 20 degrees right roll (attitude assembly rotates counterclockwise). Check that tilt table indicates 20 ±3 degrees right roll.
(6)
Tilt vertical gyro No. 1 until captain's ADI indicates 20 degrees left roll. Check that tilt table indicates 20 ±3 degrees left roll.
(7)
Repeat steps (3) thru (6) using vertical gyro No. 2 and first officer's ADI.
(8)
Place VERTICAL GYRO transfer switch in BOTH ON 2 position and repeat steps (3) thru (6) using vertical gyro No. 2 and captain's ADI.
(9)
Place VERTICAL GYRO transfer switch in BOTH ON 1 position and repeat steps (3) thru (6) using vertical gyro No. 1 and F/O's ADI.
(10)
Return vertical gyros to level attitude.
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D. Restore Airplane to Normal
(1)
Open all attitude reference system circuit breakers.
(2)
Allow 3 minutes for gyros to run down; install in airplane and connect electrical cables.
(3)
Close system circuit breakers and verify that system indicates attitude of airplane.
(4)
Determine whether there is further need for electrical power, if not, remove power.
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VERTICAL GYRO -REMOVAL/INSTALLATION
1. General
A. A gyro should not be removed from its seating position until its rotor has come to rest. At least 3 minutes should be allowed after switch off, in order to meet this requirement.
B. Particular care should be exercised in transporting a gyro from place to place. It is a delicate instrument which will not withstand knocks or rough handling. Use approved containers for transportation whenever possible.
C. Where necessary, laminated shim stock is used to seat each gyro within required tolerances relative to the airplane's axes. Prior to incorporation of SB 34-1171, (on airplanes with shims bonded to the mounting brackets), extreme care should be exercised when removing the gyros to ensure that the shims are not dislodged; and, if they are, to return them to their original positions when replacing the gyro. After incorporation of SB 34-1171, the shims are riveted to the mounting brackets.
2. Remove Vertical Gyro
A. Remove power from the attitude system.
B. Remove three screws attaching gyro to mounting plate (Fig. 401).
C. Bag screws and attach to gyro or mounting.
D. Disconnect electrical connector from gyro to be removed. (Move gyro as necessary to gain access to electrical connectors.)
E. Remove gyro.
3. Install Vertical Gyro
A. Place vertical gyro on mounting plate as shown in Fig. 401. Arrow on top of unit should be pointing forward.
B. Connect electrical connector; tighten and lockwire.
C. Align holes in mounting surfaces and install three mounting screws. Tighten screws.
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Vertical Gyro Installation 5C8
34-22-11 Figure 401 Jun 20/86
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BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
D. Connect external electrical power or use APU power.
E. Check that all vertical gyro, F/O's ADI and CAPT's ADI circuit breakers are closed.
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