(b)
Put the cooling air tube around the LPT case.
(c)
Lubricate the threads of the bolts, which attach the ends of the cooling air tubes, with engine oil.
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////////////////////////A / PW4000 SERIES /747-400 / ENGINES/MAINTENANCE MANUAL ////////////////////////
(d) Attach the ends of the cooling air tube to the collector with
the bolts.
1) Tighten the bolts with your hand.
2) Attach the covers to the collectors with the bolts.
a) Tighten the bolts with your hand.
(e) Lubricate the threads of the bolts, which attach the clamps for
the bridge brackets, with engine oil.
(f) Install the clamps to the aft mounts of the bridge brackets and
attach them to the Flange P brackets with the bolts and nuts.
1) Tighten the bolts with your hand.
(g) Lubricate the threads of the bolts, which attach the forward
end of the bridge brackets, with engine oil.
(h) Attach the forward end of the bridge brackets to the Flange N
brackets with the bolts and nuts.
NOTE: If you install the bolt and nut at approximately the____
8 o'clock position, also attach the High Pressure
Turbine (HPT) tube clamp with the bolt and nut.
1) Tighten the bolts to 36-40 pound-inches (4.1-4.5
newton-meters).
(i) Tighten the bolts which attach the aft mounts of the bridge
bracket to the Flange P brackets to 36-40 pound-inches (4.1-4.5
newton-meters).
(j) Lubricate the threads of the bolts, which attach the tube
clamps to the bridge brackets, with engine oil.
(k) Attach the tube clamps for the cooling air tube, and angle
bracket for the forward lower cooling air tube at the 5 o'clock
position, to the bridge brackets with the bolts and nuts.
1) Tighten the bolts to 36-40 pound-inches (4.1-4.5
newton-meters).
(l) Tighten the bolts which attach the cooling air tubes to the
collector to 36-40 pound-inches (4.1-4.5 newton-meters).
(m) Tighten the bolts that attach the cover assemblies on the two
sides of the engine to 36-40 pound-inches (4.1-4.5
newton-meters).
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S 414-028-N00
CAUTION: DO NOT USE LUBRICANTS ON THE TUBE NUTS OF THE PT4.95 PRESSURE
_______ TUBE FOR THE EEC. THE USE OF LUBRICANTS CAN CAUSE CONTAMINATION OF THE EEC.
(3) ENGINES PRE-PW-SB 79-76; For the lower cooling air tubes, install the PT4.95 pressure tube for the EEC with the steps that follow:
(a)
Remove the protection caps from the PT4.95 pressure tube.
(b)
Put the PT4.95 pressure tube on the engine.
(c)
Attach the forward tube nut to the tube adapter to the rear of the Flange N. 1) Tighten the tube nut with your hand.
(d)
Install the tube nut to the tube coupling at approximately the 7 o'clock position and aft of Flange P.
(e)
Install the tube nut to the tube coupling at approximately the 8 o'clock position and aft of Flange N.
(f)
Lubricate the threads of the tube clamp bolt, which attaches the tube clamp to the bracket location on Flange N, with oil.
(g)
Install the tube clamp on the PT4.95 pressure tube at the bracket location on Flange N with the tube clamp bolt. 1) Tighten the tube clamp bolt with your hand.
(h)
Lubricate the threads of the tube clamp bolt, which attaches the tube clamp to the diffuser case, with oil.
(i)
Install the tube clamp on the PT4.95 pressure tube to the diffuser case location with the tube clamp bolt. 1) Tighten the tube clamp bolt with your hand.
(j)
Tighten the tube nuts to 270-300 pound-inches (30.5-33.9 newton-meters). 1) Safety the tube nuts with lockwire or safety cable and
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