AD 2009-07-05
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Aviat | Various | Airworthiness Directives; ATR Model ATR72 Airplanes |
Unsafe Condition
Incomplete accomplishment instructions in SB ATR72-27-1059 original issue and Revision 1 failed to mention installation of cotter pins to secure self-locking nuts after re-installation of the modified Pitch Uncoupling Mechanism (PUM). The non-installation of these cotter pins causes the fail-safe criteria of the pitch control design requirements to be unmet, potentially leading to loss of pitch control on one side or complete loss of pitch control.
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Required Actions
Inspect for the presence of the four cotter pins securing the self-locking nuts on the Pitch Uncoupling Mechanism (PUM) input levers and output rods. Install the cotter pins if they are found to be missing.
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Compliance Time
Before further flight
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Affected Aircraft
ATR Model ATR72-101, -102, -201, -202, -211, -212, and -212A airplanes, all serial numbers, certificated in any category, where Service Bulletin ATR72-27-1059 was done in service at original issue or Revision 01, except those with Revision 02, Revision 03, or ATR Modification 05572.
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Source: Official FAA Source ↗
Retrieved: Apr 6, 2026
Rights: U.S. Government Public Domain
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