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engines, Teledyne Continental Motors (TCM) TSIO-360-RB reciprocating engines, and Superior Air
Parts, Inc. IO-360 series reciprocating engines with certain Precision Airmotive LLC RSA-5 and
RSA-10 series fuel injection servos.
Background
This emergency AD results from eighteen reports of fuel injection servo plugs, part number
(P/N) 383493, that had loosened or completely backed out of the threaded plug hole on the regulator
cover of the fuel injection servo. These servo plugs were installed with servo plug gasket, P/N
365533, under the plug hex-head. Precision Airmotive LLC investigated and determined that servo
plug gasket, P/N 365533, can shrink from engine heat, causing the plug to lose torque against the
servo regulator cover, allowing the plug to vibrate out. The threads on the plugs were also found
damaged. Servo plug gaskets, P/N 365533, installed on RSA-5 and RSA-10 series fuel injection
servos since August 22, 2006, are made of a different material than the previous gasket part number
used. This condition, if not corrected, could result in a substantial loss of engine power and
subsequent loss of control of the airplane.
Explanation of Relevant Service Information
We have reviewed Precision Airmotive LLC Mandatory Service Bulletin (MSB) No. PRS-
107, Revision 1, dated March 6, 2008. The MSB describes procedures for inspecting servo plugs for
looseness and damage, inspecting the servo regulator cover threads for damage, on fuel injection
servos that have a servo plug gasket, P/N 365533, installed, inspecting the gasket for damage,
reinstalling acceptable parts, and torquing the servo plug to a new, higher torque to help maintain the
proper clamp-up force against the plug and cover.
Interim Action
These actions are interim actions and we might take additional rulemaking actions in the
future.
FAA’s Determination and Requirements of the Rule
We have identified an unsafe condition that is likely to exist or develop on other RSA-5 and
RSA-10 series fuel injection servos of this same type design. This AD requi res inspecting servo plugs
for looseness and damage on fuel injection servos that have a servo plug gasket, P/N 365533,
9-1
Plane Sense
9-2
9
superseded Ad
An AD is no longer in effect when it is superseded
by a new AD. The superseding AD identifies the AD
that is no longer in effect. There are no compliance
requirements for a superseded AD.
Compliance with Ads
For purposes of compliance, ADs may be divided
into two categories:
• Those of an emergency nature requiring
immediate compliance before further flight, or
• Those of a less urgent nature requiring
compliance within a relatively longer period of
time.
ADs are the “final rule” and compliance is required
unless specific exemption is granted. Aircraft owners
are responsible for ensuring compliance with all
pertinent ADs. This includes those ADs that require
recurrent or continuing action. For example, an AD
may require a repetitive inspection each 50 hours
of operation, meaning the particular inspection must
be accomplished and recorded every 50 hours of
time in service.
m CAUTION: Aircraft owners are reminded
that there is no provision to overfly the maximum
hour requirement of an AD unless it is specifically
written into the AD.
Amateur-Built Aircraft
For help in determining if an AD applies to your
amateur-built aircraft, contact your local Flight
Standards District Office (FSDO).
summary of Ads
14 CFR part 91, section 91.417, requires a record
to be maintained that shows the current status of
applicable ADs, including:
• Method of compliance;
• AD number and revision date;
• Date and time when due again, if recurring;
• Certified mechanic’s signature;
• Type of certificate; and
• Certificate number of the repair station or
mechanical performing the work.
For ready reference, many aircraft owners keep a
chronological listing of the pertinent ADs in the back
of their aircraft and engine records. Generally, a
summary of ADs contains all the valid ADs previously
published. Figure 9-1 is a sample form of summary
of ADs.
obtaining Ads
Both AD categories (small and large aircraft) are
published in biweekly supplements. All ADs are
available on the FAA website at www.faa.gov.
Advisory Circular (AC) 39-7 (as revised), Airworthiness Directives, provides additional guidance and
information for aircraft owners and operators about
their responsibilities for complying and recording
ADs. For more information, contact the FAA
　
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