Applicability: All Dowty
R321/4-82-F/8, R324/4-82-F/9, R333/4-82-F/12 and R334/4-82-F/13
propellers, if blades are installed with serial numbers (S/N)
A156121 through A156132, A156137 through A156160, A156165 to
A156168, A156177 through A156184, A156194 and A156196 through
A156200.
Note 1: These propellers are known to be
installed on, but not limited to CASA 212, M7 Aerospace (formerly
Fairchild, Swearingen) SA227TT, SA227AT and SA227AC, and BAE
Systems (formerly British Aerospace) Jetstream 3100 and 3200 series
aeroplanes.
Requirement:
Identify the propeller blades that have a serial number listed
in the applicability section of this AD and inspect the affected
blades in accordance with Dowty Propellers Alert Service Bulletin
(ASB), as applicable.
If discrepancies are found, re-machine the counterweight
attachment holes.
Note 2: Contact Dowty Propellers, for
advice.
Do not install any of the listed S/N propeller blades on an
aircraft unless the blade has been inspected and, if necessary,
reworked in accordance with the requirements of this AD.
Before further flight after the effective date of this AD.
Before further flight after the effective date of this AD.
From the effective date of this AD. This Airworthiness
Directive becomes effective on 27 October 2006.
Background: One propeller blade has recently
been identified after delivery from Dowty Propellers where the
blade counterweight capscrew holes have not been correctly drilled.
If the capscrew holes are not machined to their required depth, it
may appear that the capscrew has been correctly assembled, but the
counterweight will not be properly retained. This condition, if not
corrected, could result in failure (due to fatigue) of one or more
capscrews, release of the counterweight during propeller operation
and consequent risk of injury to aircraft occupants and persons on
the ground. Dowty has concluded that the problem is associated only
with blades manufactured between April and July 2006, identified by
serial number in the applicability section of this AD. Since an
unsafe condition has been identified that is likely to exist or
develop on other aircraft that have these propeller blades
installed, this AD is issued to require the identification,
inspection and, where necessary, rework of the affected propeller
blades.
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