AD/M20/53 - O&N Bladder Fuel Cell Contamination (Cth)

AIRWORTHINESS DIRECTIVE For the reasons set out in the background section, the CASA delegate whose signature appears below issues the following Airworthiness Directive (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.

Mooney M20 Series Aeroplanes AD/M20/53 O&N Bladder Fuel Cell Contamination 3/2005

Applicability: Mooney Airplane Company Models M20B, M20C, M20D, M20E, M20F, M20G, and M20J aircraft, all serial numbers, that are equipped with an O & N Bladder Fuel Cell installed per Supplemental Type Certificate (STC) SA2277CE or STC SA2350CE. Requirement: 1. On both the left and right wing, inspect the drain valve to assure that it was inserted fully into the drain nipple, using procedure described in O & N Aircraft Modifications Inc. Mandatory Service Bulletin (MSB) No. ON-100, dated 1 February 1998.

2. Modify any drain valve found not inserted fully into the drain nipple, using procedure described in MSB ON-100.

3. Using procedure described in MSB ON-100, perform the following, on both the left and right wing:

(a) Install a foam wedge to reduce the amount of trapped fluids in the centre fuel cell;

(b) Install an anti-ice mast forward of the vent tubes to prevent icing of the fuel tank vents;

(c) Drill a vent hole to prevent icing of the engine's crankcase breathers; and