Flight Training - November/December 2021 - 17
JARGON
Airworthiness
directive (AD)
A regulatory notice
sent by the FAA to aircraft
owners informing
the owner that a
condition prevents his
or her aircraft from
continuing to meet its
conditions for airworthiness
(it cannot be
flown until the condition
is repaired).
Thinking that there had been an engine
malfunction, the instructor " applied carburetor
heat, reduced the throttle to idle, and slowed
to the airplane's best glide speed, which was 80
mph, and executed the engine failure checklist
from memory. He circled left looking for a suitable
field in which to perform an emergency
landing and declared a mayday three times to
the air traffic control tower " in Leesburg.
" Both occupants identified several possible
landing spots, " but after receiving the report
from the airborne observer (who now became
a chase airplane for the AA-5) he added power
and flew to a landing in Leesburg. On landing,
the nose pitched down and struck the runway,
according to the NTSB's preliminary report.
A post-accident examination revealed that
" the left elevator was partially separated, with
the outboard portion of it well below the position
of the horizontal stabilizer. "
The FAA determined that " during flight,
the outboard elevator attach bracket on the
horizontal stabilizer detached causing loss of
elevator control and significant damage to the
airplane. An investigation identified corrosion
and delamination of the airplane skin
bondlines around the area of the horizontal
stabilizer where the elevator attach bracket
was attached. "
Multiple instances of similar corrosion
surfaced from subsequent field reports, raising
concerns for models with similar stabilizer
designs and the same elevator attachment methods.
The FAA concluded from the field reports
that it would take more thorough inspections to
" reliably identify corrosion and delamination of
bondlines in these critical areas " and make any
needed fixes. Making that finding legally enforceable
called for an AD.
The several compliance timelines permitted
for the horizontal stabilizer inspections were
shorter than the amount of time needed to seek
public comment on a proposed AD and publish
a final rule in the Federal Register, so the FAA
deemed the usual procedure " impractical " and
proceeded to implement the AD on a fast track.
dan.namowitz@aopa.org
http://flysca.com
Flight Training - November/December 2021
Table of Contents for the Digital Edition of Flight Training - November/December 2021
Contents
Flight Training - November/December 2021 - Intro
Flight Training - November/December 2021 - Cover1
Flight Training - November/December 2021 - Cover2
Flight Training - November/December 2021 - Contents
Flight Training - November/December 2021 - 2
Flight Training - November/December 2021 - 3
Flight Training - November/December 2021 - 4
Flight Training - November/December 2021 - 5
Flight Training - November/December 2021 - 6
Flight Training - November/December 2021 - 7
Flight Training - November/December 2021 - 8
Flight Training - November/December 2021 - 9
Flight Training - November/December 2021 - 10
Flight Training - November/December 2021 - 11
Flight Training - November/December 2021 - 12
Flight Training - November/December 2021 - 13
Flight Training - November/December 2021 - 14
Flight Training - November/December 2021 - 15
Flight Training - November/December 2021 - 16
Flight Training - November/December 2021 - 17
Flight Training - November/December 2021 - 18
Flight Training - November/December 2021 - 19
Flight Training - November/December 2021 - 20
Flight Training - November/December 2021 - 21
Flight Training - November/December 2021 - 22
Flight Training - November/December 2021 - 23
Flight Training - November/December 2021 - 24
Flight Training - November/December 2021 - 25
Flight Training - November/December 2021 - 26
Flight Training - November/December 2021 - 27
Flight Training - November/December 2021 - 28
Flight Training - November/December 2021 - 29
Flight Training - November/December 2021 - 30
Flight Training - November/December 2021 - 31
Flight Training - November/December 2021 - 32
Flight Training - November/December 2021 - 33
Flight Training - November/December 2021 - 34
Flight Training - November/December 2021 - 35
Flight Training - November/December 2021 - 36
Flight Training - November/December 2021 - 37
Flight Training - November/December 2021 - 38
Flight Training - November/December 2021 - 39
Flight Training - November/December 2021 - 40
Flight Training - November/December 2021 - 41
Flight Training - November/December 2021 - 42
Flight Training - November/December 2021 - 43
Flight Training - November/December 2021 - 44
Flight Training - November/December 2021 - 45
Flight Training - November/December 2021 - 46
Flight Training - November/December 2021 - 47
Flight Training - November/December 2021 - 48
Flight Training - November/December 2021 - 49
Flight Training - November/December 2021 - 50
Flight Training - November/December 2021 - 51
Flight Training - November/December 2021 - 52
Flight Training - November/December 2021 - 53
Flight Training - November/December 2021 - 54
Flight Training - November/December 2021 - 55
Flight Training - November/December 2021 - 56
Flight Training - November/December 2021 - Cover3
Flight Training - November/December 2021 - Cover4
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