Standby Magnetic Compass Correction Card
S 972-014
(1)
Prepare a compass correction card for the standby magnetic compass (Fig. 201). Include the tail number of the airplane and the serial number of the standby magnetic compass.
S 972-015
(2)
Use the data from the residual error swing to make a record of the steer heading in the steer column for each 30° heading increment.
NOTE: Steer Heading = Airplane Standby Compass Heading.
____
S 972-016
(3)
Make sure that the difference between the TO FLY headings and the TO STEER headings is not more than | 8 degrees (for FAA approval) or | 4 degrees (for CAA approval) for any of the 12 points calibrated.
S 972-067
(4)
Also make sure that the difference between the maximum positive and the maximum negative error is not more than 10 degrees (for FAA approval) or 7 degrees (for CAA approval).
Landing Gear Lever Latch
S 862-018
(1)
Make sure that the landing gear lever is in the down (DN) position. If it is not, move it to the down position.
S 862-017
(2)
Put the solenoid circuit back to its usual "safe" condition and
remove the ground downlocks for the landing gear.Put the Airplane Back to Its Usual Condition.
S 862-063
(1) Set the mode selector switch for each IRS to OFF.
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34-24-00
ALL ú ú 03 Page 208 ú Mar 12/01
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
S 862-064
(2) Remove the electrical power if it is not necessary
(AMM 24-22-00/201).
TASK 34-24-00-822-083
3. Standby Compass Calibrator Procedure
____________________________________
A. Equipment
(1)
Standard tow tractor or towbarless vehicle
(2)
Non-magnetic tools to adjust the standby magnetic compass.
(3)
One compass correction card - AN5823-1.
(4)
Standby Compass Calibrator Kit, Honeywell 2591553-901
(5)
Non-Magnetic Tripod
B. References
(1)
AMM 9-10-00/201, Towing
(2)
AMM 24-22-00/201, Electrical Power - Control
(3)
AMM 34-28-00/201, Inertial Reference System (IRS)
(4)
AMM 34-22-00/501, Electronic Flight Instrument System (EFIS)
(5)
AMM 34-31-00/501, VOR/ILS Navigation System
C. Access
(1) Location Zones
201/202 Flight Compartment
D. Calibrator Adjustment (Fig. 202)
S 822-084
(1) Do this procedure to calibrate the standby compass calibrator (SCC) to the magnetic field at the location of the compass rose.
(a)
Make sure that there are no vehicles or airplanes less than 220 feet away.
(b)
Make sure that there are no buildings less than 220 feet away.
(c)
Put a nonmagnetic tripod at the center of the compass swing area.
(d)
Remove the magnet assembly from the SCC.
(e)
Remove the knob assembly.
(f)
Attach a master magnetic compass to the SCC with two mounting screws.
NOTE: You can use an accurate standby magnetic compass for a
____ master magnetic compass. Make sure that the N-S and E-W adjustment screws are at neutral.
(g) Put the SCC/master compass assembly on the tripod.
NOTE: Make sure the assembly is level.
____
(h)
Turn the assembly until the master magnetic compass shows an indication of magnetic north (N).
(i)
Reinstall the magnet assembly onto the SCC..
(j)
Reinstall the knob assembly.
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