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D. Access
(1)
Location Zone
412 Engine 1 - Aft HPC Case to Fwd HPT Case
422 Engine 2 - Aft HPC Case to Fwd HPT Case
432 Engine 3 - Aft HPC Case to Fwd HPT Case
442 Engine 4 - Aft HPC Case to Fwd HPT Case
(2)
Access Panel
416 Right Thrust Reverser Half - Engine 1
426 Right Thrust Reverser Half - Engine 2
436 Right Thrust Reverser Half - Engine 3
446 Right Thrust Reverser Half - Engine 4
E.
Procedure
S 424-170-N00
(1)
Install the No.2 turbine-vane cooling air-duct:
(a)
Remove the protection caps from the TVC air duct, HPT case opening, and TVBCA valve port.
(b)
Attach a new gasket to the TVBCA valve flange with paraffin wax.
(c)
ENGINES WITHOUT PHASE 3 CHANGES PRE-PW-SB 72-315 OR PRE-PW-SB 75-57; Attach a new metering orifice seal plate, convex side out, to the HPT pad where the rear flange of the TVCA duct goes.
(d)
ENGINES WITH PHASE 3 CHANGES OR POST-PW-SB 72-315 OR POST-PW-SB 75-57; Attach a new gasket on the HPT pad where the rear flange of the TVCA duct goes.
(e)
Lubricate the threads of the bolts, which attach the TVC air duct and brackets, with engine oil.
(f)
Attach the TVC air duct and brackets to the pads on the TVBCA valve port and on the HPT case with the bolts. 1) Use the larger bolts on the aft flange. 2) Tighten the bolts with your hand.
(g)
Lubricate the threads of the bolts, which attach the clamp on the TVC air duct, with engine oil.
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(h)
Attach the clamp on the TVC air duct to the bracket on the flange M with the bolts and nuts. 1) Tighten the bolts to 85-95 pound-inches (9.6-10.7
newton-meters).
(i)
Tighten the bolts, from one corner to the opposite corner, at the forward flange to 85-95 pound-inches (9.6-10.7 newton-meters). 1) Without loosening, tighten the bolts again until the
necessary torque is kept.
(j)
Tighten the bolts, from one corner to the opposite corner, at the aft flange to 180-200 pound-inches (20.3-22.6 newton-meters). 1) Without loosening, tighten the bolts again until the
necessary torque is kept. 2) Safety the bolts with lockwire or safety cable and safety cable ferrule.
(k)
Install the accessory cooling air tube and the tube support bracket with the steps that follow: 1) Lubricate the threads of the bolts, which attach the
support bracket for the accessory cooling air tube, with engine oil. 2) Install the support bracket to the flange M and flange N
support brackets with the bolts, washers, and nuts. 3) Tighten the bolts. 4) Put the accessory cooling air tube on the HPT case. 5) Lubricate the threads of the screw, which attaches the tube
clamp for the accessory cooling air tube, with engine oil. 6) Attach the tube clamp to the support bracket on the flange
M and flange N support brackets with the screw and washer. 7) Tighten the screw. 8) Connect the tube nut to the inlet duct for the turbine case
cooling air. 9) Tighten the tube nut. 10) Connect the tube nut at the forward end of the tee on the
accessory cooling air tube. 11) Tighten the tube nut. 12) Lubricate the threads of the bolts, which attach the clamp
on the lower end of the accessory cooling air tube, with engine oil.
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13) Attach the clamp on the lower end of the accessory cooling
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本文链接地址：747-400 AMM 飞机维护手册 大气 AIR 1(60)
