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E. Standby Compass Adjustment
NOTE: The steps that follow are for the four-point calibration swing.
(1)
Turn the airplane to a magnetic heading of 0 degrees.
(2)
Remove and keep the lower left and upper right mounting screws on the standby magnetic compass.
(3)
Use the two mounting screws to install the SCC on the face of the standby magnetic compass.
(4)
Turn the top and bottom SCC dials to show an indication of E at the index line.
(5)
Make a record of the heading shown on the standby magnetic compass.
(6)
Turn the top and bottom SCC dials to show an indication of W at the index line.
(7)
Make a record of the heading shown on the standby magnetic compass.
(8)
Turn the E-W adjustment screw on the standby magnetic compass until the error in the last two recorded values is at a minimum.
NOTE: Divide the error in each of the two directions as equally as possible.
(9)
Turn the top and bottom SCC dials to show an indication of N at the index line.
(10)
Make a record of the heading shown on the standby magnetic compass.
(11)
Turn the top and bottom SCC dials to show an indication of S at the index line.
(12)
Make a record of the heading shown on the standby magnetic compass.
(13)
Turn the N-S adjustment screw on the standby magnetic compass until the error in the last two recorded values is at a minimum.
NOTE: Divide the error in each of the two directions as equally as possible.
(14)
Continue to adjust the SCC dials for each pair of directions (E-W, N-S). Then turn the E-W and N-S adjustment screws until the errors are at a minimum.
NOTE: Continue to do this procedure until the error in each pair of directions is at a minimum. Start with E-W and turn the E-W adjustment screw. Then do N-S and turn the N-S adjustment screw.
When the errors are at a minimum, do the steps that follow for the 12-point accuracy swing.
(15)
Adjust the SCC dials to indicate these magnetic headings:, 0, 30, 60, 90, 120, 150, 180, 210, 240, 270, 300, and 330 degrees.
(16)
Make a record of the magnetic heading (MH) and standby compass heading (CH).
(17)
Calculate and make a record of the difference for each 30 degree heading in the steer column on the compass correction card as follows:
D = MH - CH
(18)
During these steps, make sure each difference Is less than + 8 degrees. Make sure the difference between the maximum positive and maximum negative value is 10 degrees or less.
(19)
CAA CERTIFICATION: During these steps, make sure each difference is less than + 5 degrees. Make sure the difference between the maximum positive and maximum negative value is 10 degrees or less.
(20)
Put the SCC dials back to the N-N position.
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NOTE: Do this step to keep the magnetic strength-high.
F. Put the airplane back to its usual condition.
(1) Remove the electrical power if it is not necessary
(AMM 24-22-00/201).
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MAGNETIC STANDBY COMPASS - REMOVAL/INSTALLATION
1. Remove Magnetic Compass
A. Support compass and remove four brass screws and nuts holding compass to mount. (See figure 401.)
B. Remove compass.
2. Install Magnetic Compass
A. Insert compass in cutout in support. (See figure 401.)
B. Install brass mounting screws and nuts.
CAUTION: DO NOT USE STEEL SCREWS TO ATTACH COMPASS TO MOUNT.
C. Perform compass swing of magnetic standby compass. (Refer to 34-21-0, Compass System Maintenance Practices or 34-24-11, Magnetic Standby Compass Maintenance Practices.))
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H24452
Magnetic Standby Compass Installation 500
34-24-11 Figure 401 Nov 15/72
Page 402
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
STANDBY ARTIFICIAL HORIZON SYSTEM - DESCRIPTION AND OPERATION
EFFECTIVITY
GJ ALL EXCEPT B-2509, B-2510 and B2524
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