(2)  
Equipment and Materials

(a)  
Air source capable of delivering pressure to 50 psig at 10 pounds per minute flow

(b)  
Pneumatic Duct Pressurization Plug Set, F80211-( )

(3)  
Prepare to test pack installation pneumatic ducts.

(a)  
Open air conditioning equipment bay doors.

(b)  
Provide electrical power.

(c)  
Check that switches listed in 1.E.(3)(b) on overhead panel are OFF.

(d)  
On forward overhead panel, position ISOLATION VALVE switch to CLOSE.

(e)  
Check that indicators on turbofan control valves are at CLOSE.

(f)  
Check that pack flow control and shutoff valves indicators are at CLOSE.

(g)  
Remove turbofan valves electrical connectors and purge valve electrical connectors.

(h)  
Install closure plates on end flanges of check valves common to warm air supply ducts.

(i)  
Install closure plates at joints downstream of water separators.

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(j)  
Open OVERHEAT circuit breaker (P6).

CAUTION:  DO NOT OPEN CIRCUIT BREAKER UNTIL AFTER CLOSURE PLATES ARE INSTALLED AT WATER SEPARATOR AND HOT AIR DUCTS. HOT AIR ENTERING AIR CONDITIONING SYSTEM WITH AIR CONDITIONING SYSTEM OVERHEAT PROTECTION CIRCUIT DEACTIVATED COULD DAMAGE AIR CONDITIONING SYSTEM EQUIPMENT.

(k)  
Check that both air conditioning temperature selectors are at OFF.

(l)  
Position both PACK switches to ON.

(m)  
Hold each cabin temperature selector to MANUAL WARM until respective AIR MIX VALVE position indictor shows mix valve at approximately mid-position then release selector to OFF.

(n)  
Open access panel 3701. Remove APU relief valve from APU bleed air supply duct and connect air pressure source to relief valve port.

(4)  
Test pack installation pneumatic ducts.

(a)
Slowly pressurize ducts to 45 +3 psig and record leakage rate at 45 +3 psig.

WARNING:  DO NOT INCREASE PRESSURE TOO FAST AND STAND CLEAR OF JOINTS AS PRESSURE IS APPLIED. SUDDEN PARTING OF PRESSURIZED VESSELS CAN ENDANGER PERSONNEL AND DAMAGE EQUIPMENT.

(b)  
Check that leakage rate does not exceed 5.4 pounds per minute.

(c)  
While pressure is applied, check all joints and connections by feeling and listening. Diffused leakage is allowed at any joint; however, jet blasts are not permissible. Entire leakage allowed for duct joints should not be concentrated at one joint.

(d)  
Repeat test for ducting of remaining pack.

(e)  
Position ISOLATION VALVE switch to OPEN.

(f)  
Check that leakage rate does not exceed 8.4 pounds per minute.

(g)  
While pressure is applied, check all joints and connections by feeling and listening. Diffused leakage is allowed at any joint; however, jet blasts are not permissible. Entire leakage allowed for duct joints should not be concentrated at one joint.

(5)  
Restore airplane to normal.

(a)  
Release pressure and disconnect air supply.

(b)  
Remove duct closure plates.

(c)  
Connect warm air supply ducts to check valves and water separators to their outlet ducts.

(d)  
Remove pressure fitting and install APU relief valve and APU BLEED valve.

NOTE:  All joints disturbed for testing shall be reassembled with special consideration given to mating and seals due to the fact that individual tests may not be accomplished prior to airplane operation.
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(e)  
Install turbofan valve electrical connectors and purge valve electrical connectors.

(f)  
Close OVERHEAT circuit breaker and check that mix valve drives to full cold position.

(g)  
Position PACK switches to OFF.

(h)  
Install access panel 3701.

(i)  
Operate air conditioning packs and check disturbed joints for jet blast type leakage.

(j)  
Close air conditioning equipment bay doors.

(k)  
Remove electrical power if no longer required.

503 
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PNEUMATIC DUCT INSULATION - APPROVED REPAIR
1.  Material
A.  Heat Resistant Fiberglass Batt -BMS 8-48 or ASTM-C800 (20-30-51)
B.  Film (Reinforced Heat Resistant Fiberglass) - AN4C (20-30-51)
　
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