# Proposed AD 2002-NM-286-AD: Boeing Model 747-200B, -200C, -200F, -300, -400, -400D, and -400F Series Airplanes; and Model 747SP Series Airplanes

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2004-20-16
- Products: Boeing
- Product type: Aircraft
- Action: Notice of proposed rulemaking (NPRM).
- Published: June 23, 2004, 69 FR 34971
- Comments due: August 9, 2004
- Became: [AD 2004-20-16](https://openairdocs.org/ad/2004-20-16)
- Docket: 2002-NM-286-AD
- FR document: 04-14181
- Official PDF: https://openairdocs.org/files/sha256/a0/79/a079a2390d16573074ea7b8d8eec2a5ac11a3242bf53e0b8720d1499221eb38e (from https://www.govinfo.gov/content/pkg/FR-2004-06-23/pdf/04-14181.pdf)
- Federal Register: https://www.federalregister.gov/documents/2004/06/23/04-14181/airworthiness-directives-boeing-model-747-200b--200c--200f--300--400--400d-and--400f-series
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/6946C2E98456947B86256EBC00461A95.0001
- Page: https://openairdocs.org/proposed/2002-NM-286-AD

## Summary

This document proposes the adoption of a new airworthiness directive (AD) that is applicable to certain Boeing Model 747-200B, -200C, -200F, -300, -400, -400D, and -400F series airplanes; and Model 747SP series airplanes. This proposal would require repetitive functional tests of the auxiliary power unit (APU) and engine fire shutoff switches and repetitive replacements of the APU and engine fire shutoff switches. This proposal would also provide an optional terminating action for the repetitive inspections and replacements. This action is necessary to prevent mineral build-up on the APU and engine fire shutoff switches, which could lead to failure of the switches to discharge fire suppressant in the affected area and could result in an uncontrolled fire that could spread to the strut, wing, or aft body of the airplane. This action is intended to address the identified unsafe condition.

## Notices in this docket

- Jun 23, 2004: Notice of proposed rulemaking (NPRM). (first notice), FR document 04-14181, comments due Aug 9, 2004 (https://www.federalregister.gov/documents/2004/06/23/04-14181/airworthiness-directives-boeing-model-747-200b--200c--200f--300--400--400d-and--400f-series)

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