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747-400 MAINTENANCE MANUAL
2) Apply the applicable polishing compound to the buffer wheel. 3) Hold the buffer wheel parallel to the direction that you
polish. 4) Polish in the forward-to-aft direction. 5) Use sufficient pressure to remove the stains and scratches. 6) Move the buffer wheel in the correct direction to keep the
finish in a good condition. 7) Apply the applicable polishing compound to the buffer wheel frequently. 8) Remove the dried polish material from buffer wheel frequently. 9) Remove the dried polish material from the airplane surface with the wipers and solvent.
NOTE: Put solvent on the heavy polish material to make
____ it soft before you wipe it off.
10) Do the procedure to Clean the External Surfaces of the Airplane in the polished area. 11) Put some water on the surface, and make sure the water becomes drops.
12) If the surface was conversion coated before it was polished, apply Alodine 1000 with a swab, cloth, or sponge (AMM 51-21-04).
S 603-020
(3) PROCEDURE III - Polish the surface to repair damage that penetrates the clad aluminum.
NOTE: There is a test in PROCEDURE II to find if a scratch
____
penetrates the clad aluminum.
(a) Use the soft wipers to clean the damaged area.
NOTE: Wipe the damaged area carefully to prevent scratches.
____
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747-400 MAINTENANCE MANUAL
(b) Remove the burr edge as follows: 1) Apply the lubricant to the burnishing tool. 2) Move the burnishing tool in the direction of the scratch so
that the clad aluminum material is moved into the defective area.
NOTE: Keep the area that you burnish to minimum.
____
3) Move the burnishing tool on the repaired area so the area has a smooth surface, and so the stress is applied on a large area.
4) If the burnished area does not blend in with the adjacent surface, continue as shown in PROCEDURE II.
F. Put the Airplane Back In Its Usual Condition
S 843-039
WARNING: FAILURE TO REMOVE COVERS FROM PITOT STATIC PROBES BEFORE FLIGHT
_______ MAY CAUSE LARGE ERRORS IN AIRSPEED-SENSING AND ALTITUDE-SENSING SIGNALS WHICH MAY LEAD TO LOSS OF SAFE FLIGHT.
CAUTION: MAKE SURE THE PITOT-STATIC PROBE COVERS ARE IN GOOD WORKING
_______ CONDITION WITH NO EVIDENCE OF DAMAGE, ESPECIALLY FRAYING AROUND THE COVER OPENING. FRAYED FIBERS FROM THE COVER COMBINED WITH OTHER SUBSTANCES SUCH AS DIRT, GREASE AND FLUIDS CAN CAUSE OBSTRUCTION IN THE PROBE.
CAUTION:_______REMOVE ALL COVERS. ENGINES SHOULD NOT BE OPERATED WITH COVERS IN PLACE BECAUSE THE COVERS CAN COME OFF AND DAMAGE THE ENGINES.
(1) Remove covers from the following components:
(a)
Pitot static probes
(b)
Angle-of-Attack Sensor
(c)
Engine inlet, fan exhaust, and turbine exhaust
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747-400 MAINTENANCE MANUAL
(d)
Brakes
(e)
Tires
S 013-042
(2) Remove the PITOT PROBES COVERED tag from the left control wheel in the flight deck.
S 843-038
WARNING: FAILURE TO REMOVE BARRICADE TAPE AND VINYL ADHESIVE TAPE FROM
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