ENSTROM F-28F/280F SERIES MAINTENANCE MANUAL
Rev.
5
MM-4-62
Nov
5/13
(11) Inspect all components of the drive system.
(12) Refer to the latest revision of Textron-Lycoming Service Bulletin 533 for the
recommended engine inspection.
4-59. Tail Rotor Blade Strike/Sudden Stoppage – Special Instruction
A. Strike tab missing but no physical damage to the tail rotor blade(s).
(1) Inspect the taper pins, flex packs, and drive shaft hubs at the tail rotor transmission
coupling location (para. 10-6, C). If no damage is found, make a log book entry
and notify Enstrom Helicopter Corporation to order replacement strike tabs. If
damage is found, proceed to the following paragraph for inspection procedures.
B. Obvious physical damage to the tail rotor blade. Perform the following:
(1) Remove the tail rotor transmission with the tail rotor pitch controls, the input drive
hub, and the tail rotor assembly.
(a)
Remove the tail rotor pitch controls and inspect in accordance with the
inspection tables in para. 10-4, C.
(b)
Return the tail rotor transmission to Enstrom Helicopter Corporation for
inspection and overhaul/replacement.
(c)
Inspect the tail rotor assembly in accordance with the inspection tables in
para. 10-1, F.
(2) Replace all tail rotor driveshaft taper pins.
(3) Inspect the tail rotor driveshafts for complete or partial failure at the taper pin holes.
(4) Inspect the taper pin hole in the main rotor transmission pinion for complete or
partial failure. If damage is found, return the main rotor transmission to Enstrom
Helicopter Corporation for overhaul/replacement.
(5) Magnetic particle inspect the tail rotor driveshafts.
(6) Inspect the hangar bearing housings and attachments.
(7) Inspect the tail rotor control cables and pulley attachments.
(8) Inspect the tail rotor pedal push-pull rods and bellcranks.
4-60. Hard Landing – Special Instruction
A. In the event of a hard landing which may or may not be associated with a main or tail
rotor strike, perform the following:
(1) Inspect the forward and aft crosstube for bends or bowing. Replace the crosstube
if bent or bow is greater than 0.5 inches/13 mm. It will be necessary to hoist the
aircraft or remove the crosstubes to obtain a measurement.
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