# Proposed AD FAA-2009-0803: Honeywell International Inc. Auxiliary Power Units Models GTCP36-150(R) and GTCP36-150(RR)

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2010-12-09
- Products: Honeywell International
- Product type: Appliance
- Action: Notice of proposed rulemaking (NPRM).
- Published: December 23, 2009, 74 FR 68196
- Comments due: February 22, 2010
- Became: [AD 2010-12-09](https://openairdocs.org/ad/2010-12-09)
- Docket: FAA-2009-0803 (https://www.regulations.gov/docket/FAA-2009-0803, where comments are filed)
- Project: 2009-NE-34-AD
- FR document: E9-30512
- Official PDF: https://openairdocs.org/files/sha256/b3/17/b3171720c9cd08b7e9938eeceff6dcb506fe50d20707aaf97d438a2b9b744fba (from https://www.govinfo.gov/content/pkg/FR-2009-12-23/pdf/E9-30512.pdf)
- Federal Register: https://www.federalregister.gov/documents/2009/12/23/E9-30512/airworthiness-directives-honeywell-international-inc-auxiliary-power-units-models-gtcp36-150r-and
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/B71594ADB94D2C2E8625769B005B7EB7.0001
- Page: https://openairdocs.org/proposed/FAA-2009-0803

## Summary

The FAA proposes to adopt a new airworthiness directive (AD) for Honeywell International Inc. auxiliary power units (APU) models GTCP36-150(R) and GTCP36-150(RR). This proposed AD would require inspecting the fuel control unit (FCU) differential pressure (Delta P) sleeve bore for erosion, replacing the FCU if it fails the inspection, and installing a fuel deflector on the Delta P sleeve of the FCU. This proposed AD results from eight reports of fuel leakage from the fuel control unit. We are proposing this AD to prevent fuel leakage in the APU compartment, which could lead to ignition of fuel vapor, creating a fire and explosion hazard resulting in injury, and damage to the APU and the airplane.

## Notices in this docket

- Dec 23, 2009: Notice of proposed rulemaking (NPRM). (first notice), FR document E9-30512, comments due Feb 22, 2010 (https://www.federalregister.gov/documents/2009/12/23/E9-30512/airworthiness-directives-honeywell-international-inc-auxiliary-power-units-models-gtcp36-150r-and)

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