Engine Cowls

INTRODUCTION As a C-135 crew chief, you will open the F-108 engine cowlings for inspections or if something is potentially wrong with the engine. You will not perform this task here in technical school, but we will familiarize you with the basic steps and safety precautions. INFORMATION Technical Order Guidance The procedure to open the engine cowlings is contained in TO 1C-135-2-2-2 Ground Handling, Servicing, and Airframe. Remember that you must comply with all WARNINGS, CAUTIONS, and NOTES. F-108 Engine Fan Cowl Opening and Closing Two personnel are required to open and close engine fan cowls (Figure 1-28). There are four latches located on the bottom to latch cowlings together. WARNING: No maintenance will be performed inside fan cowl area until both hold-open actuators (Figure 1-29) are installed and locked. The hold-open actuators are used to hold the fan cowl open. NOTE: Under windy conditions one additional technician is recommended to control the opposite fan cowl after latches are released

CAUTION: Hold-open actuator is spring loaded; hold the actuator clear of engine before extension lock is released.

F-108 Engine Fan Duct Opening and Closing CAUTION: Do not raise the inboard fan duct on engines No. 1 or 4 when leading edge flaps are extended. Do not raise inboard fan duct on engines No. 2 or 3 with wing leading edge blowout doors open. Damage to fan duct, flap, and doors may occur. Ensure that flaps are raised and that flap handle is in the up position and attach AFTO Form 492, MX WARNING TAG to flap handle. WARNING: No personnel are allowed inside fan duct cowling area until actuator is extended completely and hold-open lock engaged (Figure 1-30 & 1-31).

CAUTION: Power tools will not be used to drive the fan duct actuator (Figure 1-30). Damage to the actuator will result. Use hand operated tools only. There are five latches that keep both fan ducts latched together. Fan duct actuator is used to raise the fan duct. The fan duct hold-open lock is used to support the fan duct while open (Figure 1-31).