Technical data

13773-001
5-50
Page 1
UNSCHEDULED MAINTENANCE CHECKS
1. DESCRIPTION
During operation, the airplane may be subject to:
A. Hard/Overweight Landings
A hard landing is any landing made at what is believed to be an excessive sink rate. An overweight
landing is defined as landing the airplane at any gross weight which exceeds the maximum take-off
weight as specified in the Pilot’s Operating Handbook and the Airplane Flight Manual.
B. Overspeed
Anytime an airplane has exceeded one or both of the following:
- Airplane overspeed exceeding placard speed limits of flaps.
- Airplane overspeed exceeding design speeds.
C. Severe Air Turbulence or Severe Maneuvers
Atmospheric conditions producing violent buffeting of airplane. Severe maneuvers can be defined as
any maneuvers exceeding the Pilot’s Operating Handbook and the airplane’s flight limits.
D. Lightning Strike
If flown through a region of the atmosphere where electrical discharge is occurring, the airplane may
become part of the discharge path. During a lightning strike, the current enters the airplane at one
point and exits another, usually at opposite extremities. It is in these entrance and exit points where
damage is most likely to occur. Burning and/or eroding of small surface areas of the skin and structure
may be detected during inspection. In most cases, the damage is obvious. In some cases, however,
hidden damage may result. In the case of lightning strike, this inspection must be accomplished before
returning it to service.
E. High Drag/Side Loads Due to Ground Handling
A high drag/side load condition is defined as situations when the airplane skids or overruns from a pre-
pared surface onto an unprepared surface. This condition can also be met due to landings short of pre-
pared surfaces, landings which cause the blowing of tires, or skidding conditions where the safety of
the airplane was in question. This covers takeoffs, landings, or unusual taxi conditions.
When any of these conditions are reported, a visual inspection of the airframe and the components
involved must be accomplished. The inspections are performed to determine the extent of damage to the
structure and components adjacent to the area of damage. In the case of lightning strike, a comprehensive
inspection of the airplane exterior is performed to locate possible damage. If foreign object damage is sus-
pected, a visual inspection of the airplane must be accomplished before the airplane is returned to service.
30 Nov 2000