# Airworthiness Directives; Fokker Model F.27 Mark 050 Airplanes
> **Rule** · Final rule; request for comments. · Published 2009-03-24 · Effective 2009-04-08 · 74 FR 12238
## Document
- **Document number:** E9-5958
- **Category:** airworthiness
- **Manufacturer:** Fokker Model F.27 Mark 050
- **Type:** Rule
- **Action:** Final rule; request for comments.
- **Citation:** 74 FR 12238
- **Publication date:** 2009-03-24
- **Effective date:** 2009-04-08
- **FAA docket:** Docket No. FAA-2009-0224
## Abstract

The FAA is superseding an existing airworthiness directive (AD) that applies to certain Fokker Model F.27 Mark 050 airplanes. The existing AD currently requires repetitive visual checks for oil leaks of both engines between the spinner and the engine cowling, and directly behind the heated intake lip of the engine; repetitive inspections for oil leaks at the feathering pump on both engines; and corrective actions if necessary. This new AD retains the requirements of the existing AD. This AD also requires replacing the outlet port (high-pressure) bobbin with a new, improved outlet port (high-pressure) bobbin, which terminates the repetitive visual checks and inspections. This AD results from reports of oil leakage at the engine feathering pump. We are issuing this AD to prevent oil loss from the feathering pump, which could cause the engine to shut down in flight.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2009/03/24/E9-5958/airworthiness-directives-fokker-model-f27-mark-050-airplanes)
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