# Proposed AD 97-NM-138-AD: Boeing Model 747-400 Series Airplanes

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 98-09-29
- Action: Notice of proposed rulemaking (NPRM).
- Published: November 25, 1997, 62 FR 62726
- Comments due: January 9, 1998
- Became: [AD 98-09-29](https://openairdocs.org/ad/98-09-29)
- Docket: 97-NM-138-AD
- FR document: 97-30868
- Official PDF: https://openairdocs.org/files/sha256/6d/5c/6d5c8b4ae279b8932e69429fc99f132389aa9d4a9df4326daeb174537eedda99 (from https://www.govinfo.gov/content/pkg/FR-1997-11-25/pdf/97-30868.pdf)
- Federal Register: https://www.federalregister.gov/documents/1997/11/25/97-30868/airworthiness-directives-boeing-model-747-400-series-airplanes
- Page: https://openairdocs.org/proposed/97-NM-138-AD

## Summary

This document proposes the adoption of a new airworthiness directive (AD) that is applicable to certain Boeing Model 747-400 series airplanes. This proposal would require removal and reconfiguration of the battery grounds of the auxiliary power unit (APU). This proposal is prompted by reports of smoke or fire coming from the APU due to battery grounds that were not installed or maintained properly. The actions specified by the proposed AD are intended to prevent overheating and heat damage of the APU battery grounds due to improper installation of the APU battery ground, which could result in heat damage and consequent smoke or fire on the airplane.

## Notices in this docket

- Nov 25, 1997: Notice of proposed rulemaking (NPRM). (first notice), FR document 97-30868, comments due Jan 9, 1998 (https://www.federalregister.gov/documents/1997/11/25/97-30868/airworthiness-directives-boeing-model-747-400-series-airplanes)

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