H27273
553 Engine Nose Cowl
May 01/75 Figure 2 71-11-0
Page 5
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
REMOVABLE COWL PANELS - REMOVAL/INSTALLATION
1. Remove Engine Side Removable Cowl Panels
A. Open pin latch at forward lower corner of right side cowl panel.
B. Release tension latches joining left and right removable cowl panels by inserting screwdriver into each latch slot and pulling screwdriver handle downwards (Details B and D, Fig. 401).
C. Ensure ground test lock hook is not in locking position (down). Raise left cowl panel to open position, remove quick-release safety pins from safety latches and depress two safety latches, and remove cowl from engine. Place cowl in suitable protective rack.
WARNING: LEFT COWL WEIGHS APPROXIMATELY 70 POUNDS.
CAUTION: ATTEMPTING TO OPEN LEFT COWL PANEL WITH GROUND TEST LOCK HOOK IN LOCKING POSITION CAN RESULT IN DAMAGE TO COWL PANEL.
D. Raise right cowl panel to open position, remove quick- release safety pins from safety latches and depress two safety latches, and remove cowl from engine. Place cowl in suitable protective rack.
WARNING: RIGHT COWL WEIGHS APPROXIMATELY 50 POUNDS.
2. Install Engine Side Removable Cowl Panels
CAUTION: ON ENGINES WITH OPERABLE P&D VALVE DRAIN SYSTEM, DO NOT INSTALL SIDE COWL WITH P&D VALVE DRAIN HOLE PLUGGED IN COWL. INSTALLATION OF PLUGGED COWL ON ENGINE WITH OPERABLE P&D VALVE DRAIN SYSTEM WILL RESULT IN FUEL COLLECTING IN THE COWL.
DO NOT INSTALL OTHER JT8D ENGINE COWL PANELS ON JT8D-17 ENGINES. DAMAGE TO FUEL CONTROL MAY OCCUR.
NOTE: Prior to closing left side cowl panel, depress spring retainer attached to gearbox oil breather duct on inside of cowl to ensure freedom of movement. Improper seating of the breather duct seal will result in accumulated oil precipitate in the lower cowl area due to seal leakage.
A. Support cowl panel in fully open position and engage panel hinge hooks on fixed fairing hinge rollers (Fig. 401). Close safety latches and install quick-release safety pins.
B. Lower cowl panel into closed position.
C. Install other side cowl panel.
513
Aug 15/76 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 71-11-11 Page 401
Engine Cowl Installation 548
71-11-11 Figure 401 Nov 1/74
Page 402
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
D. Check cowl frames and air duct clearance with modeling clay to ensure approximately 0.125 inch minimum clearance. Readjust air ducts if clearance is not adequate, recheck for air leaks if any relocation of ducts was necessary on next engine run.
E. Engage ground test lock hook. Refer to Removable Cowl Panels, Adjustment/Test.
NOTE: The ground test lock hook may be in either the up (stowed) or down (locking) position when closing the cowling.
F. With left and right cowl panels in closed position, close six tension latches (Fig. 401). If adjustment is required, refer to Removable Cowl Panels, Adjustment/Test.
CAUTION: DO NOT USE TOOLS TO FACILITATE CLOSING COWL PANEL LATCHES. USE HAND PRESSURE ONLY.
G. Close pin latch at lower forward corner of right cowl panel.
H. Check to ensure all latches are properly closed, that cowling fairs with surrounding structure, that access doors operate properly, and that openings and drains are free of obstructions.
513
Oct 20/85 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 71-11-11 Page 403
REMOVABLE COWL PANELS - ADJUSTMENT/TEST
1. Removable Cowl Panel Adjustment
A. General
(1) Removable cowl panel adjustment is limited to the following:
(a)
Cowl panel safety latches actuating force.
(b)
Cowl panel tension latches closing force.
(c)
Left cowl panel ground test lock hook for freedom from binding or slack.
B. Safety Latch Adjustment
(1)
Open left and right removable cowl panels. Remove safety latch quick-release pins. (See figure 501.)
(2)
Check force required to actuate each safety latch lever to unlatched position. Lever should actuate with an applied force of 9 (+ 3) pounds at handle end (near detent holes).
(3)
If actuating force is not within specified limit , vary number of washers under base of shear pin to obtain required force. Adding washers will increase force, removing washers will decrease force. (See figure 501.)
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