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 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 rub it off.
 10) Do the Clean the External Surfaces of the Airplane procedure 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 51-21-31).
 S 602-020
 (3)  PROCEDURE III - Polish the surface to repair damage that went through the clad aluminum.
 NOTE: There is a test in PROCEDURE II to find if a scratch
____
 went through the clad aluminum.

 (a)  Use the soft wipers to clean the damaged area.
 NOTE: Rub the damaged area carefully to prevent scratches.
____
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 (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 to
 move the clad aluminum material into the defective area.
 NOTE: Keep the area that you burnish to a minimum.
____
 3)  Rub the area with the burnishing tool area until the surface is smooth.
 NOTE: This will reduce the stress on the surface.
____
 4) If the burnished area is smooth with the adjacent surface, no more work is necessary. 5) If the burnished area is not smooth with the adjacent surface, continue as shown in PROCEDURE II.
 F.  Put the Airplane Back In Its Usual Condition
 S 842-036
 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:_______REMOVE ALL COVERS. ENGINES SHOULD NOT BE OPERATED WITH COVERS IN PLACE BECAUSE THE COVERS CAN COME OFF AND DAMAGE THE ENGINES.
 CAUTION: MAKE SURE THE PITOT PROBE COVER IS IN GOOD WORKING CONDTION
_______ 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.
 (1)  Remove covers from the following components:
 (a)  
Pitot static probes

 (b)  
Engine inlet, fan exhaust, and turbine exhaust (Ref 71-00-03)

 (c)  
Brakes

 (d)  
Tires

 S 022-037
 (2)  Remove the "PITOT PROBES COVERED" tag from the left control wheel in the flight deck.
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 S 842-038
 WARNING:_______ FAILURE TO REMOVE BARRICADE TAPE AND VINYL ADHESIVE TAPE FROM
 THE STATIC PORTS BEFORE FLIGHT MAY CAUSE LARGE ERRORS IN
 AIRSPEED-SENSING AND ALTITUDE-SENSING SIGNALS, WHICH MAY LEAD
 TO LOSS OF SAFE FLIGHT.

 CAUTION: REMOVE ALL BARRICADE TAPE, COVERS, POLYEHTYLENE SHEET AND VINYL
_______ ADHESIVE TAPE. ENGINES SHOULD NOT BE OPERATED WITH COVERS IN PLACE BECAUSE THE COVERS CAN COME OFF AND DAMAGE THE ENGINES.
 (3)  Remove all barricade tape, covers, polyethylene sheet and vinyl adhesive tape from the following openings:
 (a)  
Static ports

 1)  Inspect each static port and if necessary use naphtha or equivalent, and a clean dry rag to remove all tape residue, dirt and other contaminants around the static ports.

 (b)  
Surge tank and fuel tank vents

 (c)  
APU exhaust duct outlet port

 (d)  
Forward outflow valve port (AMM 21-43-11)

　
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