(2)  
Statically ground the airplane (Ref. 20-41-11).

(3)  
Close all passenger doors, cargo doors, emergency exits, and access doors and panels.

501 
May 01/98  BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  12-40-0 Page 203 

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:  USE COVERS, BLACK POLYETYLENE SHEET AND YELLOW VINYL ADHESIVE TAPE TO KEEP LIQUIDS OUT OF AREAS THAT CONTAIN MECHANICAL, ELECTRICAL, OR HYDRAULIC COMPONENTS. LIQUIDS THAT GET INTO THESE AREAS CAN CAUSE CORROSION, FREEZE DURING AIRPLANE FLIGHT, OR REMOVE NECESSARY LUBRICANTS.
(4)  
Put the covers on these components:

(a)  
Pitot static probes (see Fig. 201 for locations of pitot static probes)

(b)  
Engine inlet and turbine exhaust

(c)  
Brakes

(d)  
Tires

(5)  
Attach a removed paper tag that has "PITOT PROBES COVERED" printed on it in black letters, to the left control wheel in the flight deck with wire.

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 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 airtight:
(a)  
Surge tank and fuel tank vents

(b)  
APU exhaust duct outlet port

(c)  
APU oil cooling air exhaust port

(d)  
Equipment cooling ground supply valve port

(e)  
Overboard exhaust valve port

(f)  
Smoke clearance valve port

(g)  
Ram air inlet and outlet doors

(h)  
Outflow valve

501 
12-40-0 Page 204  BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  May 01/98 

G87817
501  Pitot Static System Component Location 
May 01/98  Figure 201  12-40-0 
Page 205 
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 

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 AIRPLANE 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 (see Fig. 201 for locations of the static ports and Fig. 202 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. 202).

(b)  
Put one end of an approximately 4-foot long piece of the orange barricade tape over the holes of the static ports and secure the upper edge with a 5 inch piece of 3M No. 471 yellow vinyl adhesive tape (Fig. 202, steps 1 and 2).

NOTE:  Smooth the No. 471 yellow vinyl adhesive tape to make sure the bond is satisfactory to the airplane surface.

(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. 202, Step 3).
　
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