APR 2019 Chapter 5 Inspections Page 5.47
5-65 Hard Landing
NOTE
RR300 Operation and Maintenance Manual requires special
engine inspection (subtask 05-50-00-210-002) when a hard
landing exceeds 10g. While there is no single indicator for
a 10g impact, an impact was less than 10g if there was no
contact between the fuselage belly or landing gear cross tubes
and the ground. Yielding or buckling of any engine mount tubes
or crushing of the energy absorbers within any occupied seat
indicates the impact was likely greater than 10g.
The hard landing inspection is listed in two parts. Part 1 concerns yielding (bending) of
the cross tubes due to hard landing such as hovering autorotations or run-on landings that
do not apply side loads to the landing gear. Part 2 concerns hard landings that, in addition
to yielding of cross tubes, have yielding of steel tube frames or fuselage primary structure.
NOTE
Buckling and bent steel tube structure are evidence of side loads
on the airframe.
1. Yielding of cross tube due to hard landing with no side loads:
a. Perform tail rotor drive shaft runout per § 65-21.
b. Visually inspect main rotor blades for oil canning of skins and buckling. Inspect
and repair main rotor blades per §§ 62-40 and 62-50.
c. Check landing gear cross tubes for yielding beyond serviceable limit. Place
rotorcraft on level ground, push up on tail rotor gearbox and release, allowing
rotorcraft to settle, then measure from tip of tail skid to ground. If less than 38
inches, one or both cross tubes must be replaced.
d. Inspect front seat structure for yielding. Visually inspect, thru vent holes in
seat bottoms, the internal box structure for any deformation. Inspect aft seat
structure for yielding.
2. If yielding of steel tube frame(s) OR fuselage has occurred, inspect rotorcraft as
follows:
a. Perform Part 1 inspection.
b. Verify no yielding or cracks in steel tube frames.
c. Visually inspect fuselage, landing gear attach points, and firewalls for buckling
or cracks.
d. Dye penetrant inspect upper steel tube structure and all welded joints.
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