AD NUMBER: 2005-06-05 MANUFACTURER: McDonnell Douglas SUBJECT: Airworthiness Directive 2005-06-05 SUMMARY: The
FAA is adopting a new airworthiness directive (AD) for all
McDonnell Douglas Model DC-8 airplanes. This AD requires an
inspection of the pushrod assemblies for the left and right
elevator control tabs to determine if the pushrod assemblies are
made of aluminum or steel, replacing any assembly made of aluminum
with an assembly made of steel or modifying existing steel
assemblies, and other specified actions. This AD also requires an
inspection of the crank assemblies for the inboard and outboard
geared tabs of the elevator to determine if the crank assemblies
are made of aluminum or steel, replacing any assembly made of
aluminum with an assembly made of steel, and other specified
actions.
This AD is prompted by an accident
involving a DC-8 airplane. The probable cause of the accident was a
loss of pitch control resulting from the disconnection of the
pushrod for the right elevator control tab. The pushrod dropped
down and jammed in front of the control tab crank, causing a large
deflection of the control tab. We are issuing this AD to minimize
the possibility of a control tab offset. A control tab offset could
cause elevator deflection, an elevator airplane-nose-up condition,
and reduced controllability of the airplane. This AD is also
prompted by a report that the elevator on a McDonnell Douglas Model
DC-8 airplane did not respond to command inputs from the
flightcrew. We are also issuing this AD to minimize the possibility
of crank assembly failure when the assembly is exposed to abnormal
load conditions. Failure of a crank assembly could result in a
jammed elevator and consequent reduced controllability of the
airplane.
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