AD 2004-25-04
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Mooney | Aircraft Corporation Models M20B | Airworthiness Directives; Mooney Aircraft Corporation Models M20B, M20C, M20D, M20E, M20F, M20G, and M20J Airplanes |
Unsafe Condition
Improper installation of the fuel bladder drains and fuel caps could allow rainwater to enter the fuel bladders, leading to water/ice contamination in the fuel system, which could result in rough engine operation or complete loss of engine power.
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Required Actions
Inspect the drain valve to ensure it is fully inserted into the drain nipple and modify any drain valve found not fully inserted. Incorporate the design changes specified in O & N Aircraft Modifications Inc. Mandatory Service Bulletin No. ON-100. Replace flush style fuel caps with raised style caps, or alternatively, insert 'Pilot Operating Procedures for Pre-flight Fuel System Check' into the AFM as an AMOC. Install an anti-ice mast forward of the vent tubes.
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Compliance Time
Before further flight
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Affected Aircraft
Mooney Aircraft Corporation Models M20B, M20C, M20D, M20E, M20F, M20G, and M20J airplanes equipped with an O & N Bladder Fuel Cell installed per Supplemental Type Certificate (STC) SA2277CE or STC SA2350CE. Model M20B airplanes could have one of the STCs incorporated by field approval.
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Source: Official FAA Source ↗
Retrieved: Apr 6, 2026
Rights: U.S. Government Public Domain
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