AD/FSM/31 Amdt 1 Precision Airmotive Fuel Injection Servo Plugs (Cth)
AIRWORTHINESS DIRECTIVE
On the effective date specified below, and for the reasons set out in the background section, the CASA delegate whose signature appears below revokes Airworthiness Directive (AD) AD/FSM/31 and issues the following AD under subregulation 39.001(1) of CASR 1998. The AD requires that the action set out in the requirement section (being action that the delegate considers necessary to correct the unsafe condition) be taken in relation to the aircraft or aeronautical product mentioned in the applicability section: (a) in the circumstances mentioned in the requirement section; and (b) in accordance with the instructions set out in the requirement section; and (c) at the time mentioned in the compliance section.
Fuel Supply and Metering Equipment
| AD/FSM/31 Amdt 1 | Precision Airmotive Fuel Injection Servo Plugs | 7/2008 TX |
Applicability: | This AD applies to the following reciprocating engines with an installed Precision Airmotive LLC, RSA-5 or RSA-10 series fuel injection servo, having a servo plug gasket, part number (P/N) 365533, installed under the fuel injection servo plug, - Lycoming Engines IO, (L)IO, TIO, (L)TIO, AEIO, AIO, IGO, IVO, and HIO series reciprocating engines, regardless of displacement, either new, rebuilt, overhauled, or repaired since 22 August 2006, and/or with an affected fuel injection servo installed either new, rebuilt, overhauled, or repaired since - Teledyne Continental TSIO-360-RB reciprocating engines, either new, rebuilt, overhauled, or repaired since 22 August 2006, and/or with an affected fuel injection servo installed either new, rebuilt, overhauled, or repaired since - Superior Air Parts, Inc. IO-360 series reciprocating engines, either new, rebuilt, overhauled, or repaired since 22 August, 2006, and/or with an affected fuel injection servo installed either new, rebuilt, overhauled, or repaired since - This AD also applies to any other Precision Airmotive LLC fuel injection servos received since 22 August 2006, or any fuel injection servos that have had the fuel injection servo plug, P/N 383493, removed during maintenance since |
Requirement: | 1. Inspect the fuel injection servo plug, P/N 383493, for looseness, by attempting to turn it by hand, while being careful not to damage the safety wire or seal. If the plug moves, it is loose. Note 1: Requirement 1 may have been initially accomplished in accordance with the original issue of this Directive; if this is the case, no further action is necessary until a repetitive inspection interval is reached. |
| 2. If, following any Requirement 1 inspection, the plug is found to be loose, do the following: a. Carefully cut and remove the safety wire that spans between the servo plug and regulator cover only. b. Remove the servo plug while ensuring that the gasket, P/N 365533, that is behind the plug, is not lost. The gasket may be slightly stuck to the regulator cover. c. Examine the threads on the servo plug and regulator cover for damage. Threads should be smooth and consistent, with no burrs or chips. The servo plug outer diameter threads should also measure within d. If the threads on either the servo plug or the regulator cover are damaged, or do not measure within the limits in Requirement 2.c., of this AD, the servo is not eligible for any installation and must be replaced before further flight. e. Inspect the gasket, P/N 365533, for tears and other damage. CASA is allowing the re-use of undamaged gaskets. Replace damaged gaskets with a new gasket, P/N 365533. f. When reassembling, do not install any servo plug or regulator cover that is not eligible for installation. Install the gasket onto the servo plug and reassemble the servo plug to the regulator cover. g. Torque the servo plug to a new, higher torque of 90-100 in-lbs h. Safety-wire the servo plug with 0.025-inch (0.64mm) diameter wire to the regulator cover. Information on properly safety wiring the plug can be found in Precision Airmotive LLC Mandatory Service Bulletin i. Inspect all other safety wires on the servo and replace any that are damaged. Alternative Means of Compliance. The use of the actions and compliance periods detailed in Precision Airmotive Mandatory Service Bulletin PRS-107 Revision 3 dated 16 April 2008 are approved as an acceptable alternative means of compliance for this Directive. |
| Terminating Action. Installation of new gasket P/N 2577258 in accordance with Precision Airmotive Mandatory Service Bulletin PRS-107 Revision 3 dated 16 April 2008 constitutes a terminating action to the repetitive inspection requirements of this Directive. Aircraft are not to be repositioned until the initial inspection in accordance with either the original issue or Amendment 1 of this airworthiness directive has been accomplished. Note 2: No Special flight permits will be issued to reposition aircraft not in compliance with this directive. Note 3: FAA AD 2008-08-14 dated 4 April adopts those requirements previously published in FAA Emergency AD 2008-06-51. | |
Compliance: | 1. For Requirement 1 - Before further flight and thereafter at the following intervals until the optional terminating action has been applied. a If the plug HAS NOT BEEN re-torqued - At every engine oil change or within every 50 hours of engine run time, whichever occurs first. b. If the plug HAS BEEN re-torqued - At every annual inspection or every 120 hours of engine run time, whichever occurs first. 2. For Requirement 2 - Before further flight. |
| This Amendment becomes effective on 9 May 2008. | |
Background: | The FAA have received eighteen reports of fuel injection servo plugs, P/N 383493, that had loosened or completely backed out of the threaded plug hole on the regulator cover of the fuel injection servo. The issuing of this Directive is intended to prevent a lean running engine, which could result in a substantial loss of engine power and subsequent loss of control of the aeroplane. This amendment includes an alternative means of compliance and terminating action as detailed in Precision Airmotive Service Bulletin PRS-107. The service bulletin provides for different inspection intervals and also a terminating action to the repeat inspection intervals. |
| The original issue of this AD became effective on 14 March 2008. |
James Coyne
Delegate of the Civil Aviation Safety Authority
2 May 2008
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