H27684
Oil Breather Pressure Test 500
79-21-0 Page 202 Figure 201 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. Aug 15/79
I. Compare recorded gearbox breather pressure with maximum allowable pressure of 8.5 inches Hg (4.2 psig) *[1].
*[1] 7.1 inches Hg (3.5 psig) for engines with No. 4 bearing carbon seal (incorporated by original build or by P&WA SB 5250).
NOTE: Engines with breather pressure tests conducted using continuous permanent recording equipment may be continued in service if the steady state limit of 7.1 in. Hg. (3.5 psi) is exceeded for no more than 30 seconds and the pressure level does not exceed 10.2 in. Hg. (5.0 psi). An engine accepted to this additional limit must be put on watch and a repeat test conducted every 50 cycles thereafter.
Total breather pressure must not exceed 13 in. Hg. that is, back pressure produced by any ducting attached to breather vent must not exceed difference between engine breather pressure and 13 in. Hg.
J. Shut down engine.
K. If gearbox breather pressure is not within acceptable limits (Ref P&WA 72-00, Engine -Troubleshooting).
L. Remove test equipment, and install elbow in LV3 port and connect vent tube to gearbox, or reinstall P&WA LV3 gearbox fitting, as applicable.
M. Install engine cowl panels (Ref 71-11-11).
506
Feb 20/85 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 79-21-0 Page 203
FUEL/OIL COOLER - REMOVAL/INSTALLATION
1. General
A. The fuel/oil cooler, located on the engine left side at about the 8 o'clock position, is paired with the fuel flow transmitter in a common assembly. To facilitate removal of the fuel/oil cooler, the unit is removed with the fuel flow transmitter. The two components can then be separated.
2. Prepare to Remove Fuel/Oil Cooler
A. Open applicable Oil Temperature and Pressure circuit breaker on panel P6.
CAUTION: FAILURE TO OPEN CIRCUIT BREAKER BEFORE REMOVING OIL TEMPERATURE BULB ELECTRICAL CONNECTOR MAY RESULT IN DAMAGE TO OIL TEMPERATURE INDICATOR.
B. Open applicable Fuel Flow circuit breaker on panel P6 to prevent fuel flow transmitter damage resulting from dry operation.
C. Open left side cowl panel.
D. Place suitable container under fuel/oil cooler and fuel flow transmitter to catch fuel and oil spillage.
E. Remove drain plug at bottom of fuel inlet connector tube (14, figure 401) and drain fuel into container.
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