747飞机维护手册AMM CHAPTER 34 - NAVIGATION 第34章导航1(53)

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 NOTE: If left alternate static port is to be removed, be sure not to
____ confuse it with cabin pressure port which is identical to left alternate static port.
 B.  Clean away sealant around port (Ref 20-30-01).
 C.  Loosen fitting that connects static hose to static port and remove hose from static port. Cap static hose to prevent entry of foreign material.
 CAUTION: DO NOT TWIST OR KINK THE STATIC HOSE DURING THIS PROCESS; A
_______ KINKED HOSE MAY RENDER THE ALTERNATE STATIC SYSTEM INOPERATIVE.
 D.  Remove retaining nut and washer, and remove static port from its mounting hole (from outside).
 CAUTION: TO MAINTAIN ACCURATE PRESSURE SENSING IN THIS AREA, DO NOT
_______ MARK SURFACE OF AIRPLANE SKIN DURING THIS STEP - PARTICULARLY IN AREA BORDERED BY PAINTED CIRCLE.
 4.  Install Alternate Static Port (Fig. 401)
_____________________________
 A.  Station a man, with static port to be installed, at mounting hole outside airplane.
 B.  Clean away any remaining sealant and prepare area for application of new sealant (Ref 20-30-01).
 C.  From outside airplane, insert static port in mounting hole, adjust until face of port is as flush with airplane skin as possible, and hold in place.
 D.  From inside airplane, place retaining washer and then retaining nut on port and tighten retaining nut to a torque range of 250 to 400 inch-pounds.
 E.  Install lockwire using double twist method.
 EFFECTIVITY

 
 ALL  01 Page 401  Oct 10/7334-11-02
STATIC PORT
SEE A
FWD
NOTE:RIGHT PORT SHOWN, LEFT PORT SIMILAR.
A
Alternate Static-Port - Removal/Installation
Figure 401

EFFECTIVITY

ALL
701 Page 402
34-11-02
Oct 10/73
 F.  Shave external surface of static port until it is flush with airplane skin within +0.003/-0.000 inch. After this shaving is complete, see that surface finish on face of static port is 63 RHR maximum. Check to see that no burrs or materials are in static ports.
 G.  Brush alodize external surface of static port (Ref 20-30-02).
 H.  From inside airplane, clean out any foreign material inside static port and check all inlet holes for obstructions. From outside airplane, check all inlet holes for freedom from obstructions or deformation.
 I.  Remove protective cover from end of static hose and check for any foreign material inside hose, clean if necessary.
 J.  Connect static hose and fitting to static port.
 CAUTION: TO PREVENT HOSE OR FITTING DAMAGE, DO NOT TWIST OR KINK THE
_______
 STATIC HOSE DURING THIS PROCESS.

 K.  Apply fillet seal all around static port with sealant (Ref 20-30-05).
 L.  Perform alternate static port test.
 5.  Alternate Static Port Test
__________________________
 A.  General
 (1)  
Flushing is not normally required and must be performed only if there is reason to believe foreign material was introduced into alternate static system during disassembly/assembly.

 (2)  
Test setup, pressurization, pressure release and returning system to normal are performed per 34-11-00, Maintenance Practices.

 B.  Prepare to Test
 (1)  
On flight deck, set captain's and first officer's static source selector valves to NORMAL position.

 (2)  
Place a temporary seal over left alternate static port.

 NOTE: Seal must not extend into static port or otherwise deform
____ or alter surface in area when seal is removed.
 C.  Test Alternate Static Port
 (1)  
Pressurize alternate static system (Ref 34-11-00).

 (2)  
Operate pneumatic test unit and static control valve to apply a vacuum equivalent to 11.10 |0.10 inches of mercury (absolute pressure) or 25,000 |200 feet of altitude.

 (3)  
When required vacuum has been reached and has stabilized, close cutoff valve.

 CAUTION: TO PREVENT INSTRUMENT/EQUIPMENT DAMAGE, VACUUM MUST BE
_______ HELD AS A BACKUP BEHIND CUTOFF VALVE DURING CUTOFF PERIOD. FOLLOWING THIS, CUTOFF VALVE IS REOPENED. RELEASE VACUUM IS GRADUALLY.
 (4)  
Read and record indication on static system gage.

 (5)  
After 1 minute, read and record values indicated on static system gage. The vacuum must not have decreased by more than 0.20 inches of mercury or an equivalent fall of 400 feet in indicated altitude.

 (6)  
Return alternate static system to ambient pressure (Ref 34-11-00).

 (7)  
Remove all adapters and seals.
　
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