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A
747-400 MAINTENANCE MANUAL
 (b)  
Angle of Attack Sensor

 (c)  
Engine inlet, fan exhaust, and turbine exhaust

 (d)  
Brakes

 (e)  
Tires

 S 843-030
 (5)  Attach a red paper tag that has PITOT PROBES COVERED printed on it in black letters, to the left control wheel in the flight deck with wire.
 S 843-031
 CAUTION: WHENEVER AN OPENING IS COVERED, MAKE SURE THAT CONDITION IS
_______ VISIBLE FROM THE GROUND. ENGINES SHOULD NOT BE OPERATED WITH COVERS IN PLACE BECAUSE THE COVERS CAN COME OFF AND DAMAGE THE ENGINES.
 CAUTION: DO NOT UNDER ANY CIRCUMSTANCES SPRAY DETERGENT OR WATER
_______ DIRECTLY INTO OR AT ANY OF THE OPENINGS LISTED BELOW OR DAMAGE TO THE AIRPLANE COULD RESULT.
 (6)  Use yellow vinyl adhesive tape and black polyethylene sheet to cover and seal the following openings but do not seal them air-tight (see Fig. 303 for the locations of components to cover).
 (a)  
Surge tank and fuel tank vents

 (b)  
APU exhaust duct outlet port

 (c)  
APU oil cooling air exhaust port

 (d)  
Overboard exhaust valve port

 (e)  
Ram air inlet and outlet doors

 (f)  
Forward and aft outflow valves

 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

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747-400 MAINTENANCE MANUAL
 S 843-032
 WARNING:_______ WHEN THE STATIC PORTS ARE COVERED, MAKE SURE THAT CONDITION IS
 VISIBLE FROM THE GROUND.  IN ADDITION, ATTACH A TAG TO THE LEFT
 CONTROL WHEEL IN THE FLIGHT DECK AS A REMINDER THAT STATIC
 PORTS ARE COVERED.  FAILURE TO OBSERVE AND REMOVE COVERINGS
 OVER STATIC PORTS BEFORE FLIGHT MAY CAUSE LARGE ERRORS IN
 AIRSPEED-SENSING AND ALTITUDE-SENSING SIGNALS, WHICH MAY LEAD
 TO LOSS OF SAFE FLIGHT.
 CAUTION:_______ WHENEVER AN OPENING IS COVERED, MAKE SURE THAT CONDITION IS
 VISIBLE FROM THE GROUND.  ENGINES SHOULD NOT BE OPERATED WITH
 COVERS IN PLACE BECAUSE THE COVERS CAN COME OFF AND DAMAGE THE
 ENGINES.
 CAUTION:_______ DO NOT UNDER ANY CIRCUMSTANCES SPRAY DETERGENT OR WATER
 DIRECTLY INTO OR AT THE STATIC PORTS OR DAMAGE TO THE STATIC
 PORTS COULD RESULT.

 (7)  Use yellow vinyl adhesive tape and orange barricade tape that has REMOVE BEFORE FLIGHT printed on it in black letters to cover the static ports in the following manner (Fig. 301 for locations of the static ports, Fig. 302 for illustrations of the static port cover procedure):
 WARNING: DO NOT PLACE 3M NO. 471 YELLOW VINYL ADHESIVE TAPE OVER
_______
 THE HOLES OF THE STATIC PORTS.

 (a)  
Clean the area around each static port with aliphatic naphtha or equivalent, and a clean dry rag where you will put the yellow vinyl adhesive tape (Fig. 302).

 (b)  
Put one end of a 4-foot piece of the orange barricade tape over the holes of the static port and secure the upper edge with 5 inches of No. 471 yellow vinyl adhesive tape (Fig. 302, Steps 1 and 2).

 NOTE: Smooth the No. 471 yellow vinyl adhesive tape to make
____ sure the bond is satisfactory to the airplane surface.
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747-400
MAINTENANCE MANUAL

 (c)  
Put a 5-inch piece of vinyl adhesive tape on each vertical edge of the barricade tape overlapping the first strip of adhesive tape (Fig. 302, Step 3).

 (d)  
Put an 8-inch piece of vinyl adhesive tape horizontally over the barricade tape below the static port holes, overlapping the two vertical strips of adhesive tape.(Fig. 302, Step 4).

 (e)  
　
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