Nose Dome Installation 500
71-11-51Page 402 Figure 401 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. Nov 15/67
4. Install Engine Nose Dome (Fig. 401)
CAUTION: FALSE EPR READINGS MAY OCCUR, IF PT2 PROBE DOES NOT PROJECT BEYOND NOSE DOME, AND/OR IF NOSE DOME PROBE HOLE IS ELONGATED.
A. Prior to installing an engine nose dome that is not new or overhauled check the following:
(1)
If Pt2 probe does not project 0.080 to 0.120 inch beyond nose dome, repair or replace.
(2)
If nose dome probe hole is elongated more than 0.15 inch (elongated hole diameter of 0.42 inch or greater) or if Pt2 probe is abraded more than one half of tube wall thickness, repair or replace.
(3)
Check that Pt2 plenum vent hole inside of nose dome is clear.
NOTE: The vent hole may be checked visually by using a mirror or by plugging the forward or aft end of the Pt2 probe and applying shop air at 5 to 10 psi pressure maximum to opposite end and listen or feel for an air leak from vent hole.
B. If interference brackets are installed on N1 tachometer generator, check that brackets are installed correctly before installation of nose dome (Fig. 402).
C. Install new O-rings, lightly lubricated with appropriate grease, in Pt2 probe coupler.
D. Lubricate O-ring at engine front accessory drive housing with grease.
E. Position nose dome on engine front accessory drive housing taking care to align with mounting studs and Pt2 probe connection.
NOTE: Ensure that right nose dome is installed on right engine, and left nose dome on left engine.
F. Tighten four captive, self-locking installation nuts, in diametrically opposite pairs, 100 to 140 pound-inches.
506
Oct 20/84 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 71-11-51 Page 403
Interference Bracket Installation 503
71-11-51Page 404 Figure 402 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. Oct 20/84
ENGINE NOSE DOME - APPROVED REPAIRS
1. General
A. Possible damage can occur to the engine nose dome in the area of the installation nut access hole unless extreme care is taken. Repairs are limited on the nose dome due to aerodynamic requirements.
Repair Nose Dome
A. On non-acoustic nose dome (engine nose dome used with engine nose cowl having secondary air inlet doors), when surface damage is evident on the forward side of the installation nut access hole of the dome, repair as follows:
(1)
A maximum of 0.75 inch material from original size may be cut away to remove damaged area.
(2)
The original contour of the forward side of the access hole must be maintained.
(3)
ALL raw edges must be treated with Alodine.
B. On acoustic nose dome (engine nose dome used with fat lip nose cowl), refer to SRM 54-30-1 or Rohr Industries Repair Manual 54-30-01 for approved repair.
501
Jun 20/83 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 71-11-51 Page 801
MOUNTS - DESCRIPTION AND OPERATION
1. General
A. The vibration isolator engine mounts support the JT8D power plants and isolate the airplane structure from adverse engine vibrations. Each power plant is supported by two forward vibration isolator mounts and a single aft vibration isolator mount. The two forward mounts are identical and may be used in any forward position on either engine. The aft mounts are also identical and may be used to support the aft end of either engine. (See figure 1.)
B. The forward vibration isolator engine mounts carry vertical, side, and axial (thrust) loads and allow for engine growth due to thermal expansion. The aft mounts take only vertical and side loads; however, they will also accommodate thermal expansion of the engine without applying axial loads to the engine flanges.
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