# AD 90-17-07: PSU Rails

- Type: Airworthiness directive
- Status: Current
- Products: Boeing 747-400 Series
- Effective: September 17, 1990
- Superseded by: Nothing supersedes this AD
- Product type: Aircraft, Large airplane
- Amendment: 39-6695
- Docket: 90-NM-58-AD
- Registered aircraft: 38 may be affected, by airframe or engine model (OpenAirDocs)
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/DD0D1CB394B376898625695F00701E1A.0001
- DRS record last changed: May 30, 2024
- Page: https://openairdocs.org/ad/90-17-07

## The airworthiness directive

90-17-07 BOEING: Amendment 39-6695. Docket No. 90-NM-58-AD.

Applicability: Model 747-400 series airplanes, listed in Boeing Service Bulletin 747-25- 2853, dated March 1, 1990, certificated in any category.

Compliance: Required within the next 90 days after the effective date of this AD, unless previously accomplished.

To prevent injury to passengers by falling PSU closure panels, accomplish the following:

A. Modify the PSU rails in accordance with Boeing Service Bulletin 747-25-2853, dated March 1, 1990.

B. An alternate means of compliance or adjustment of the compliance time, which provides an acceptable level of safety, may be used when approved by the Manager, Seattle Aircraft Certification Office (ACO), FAA, Transport Airplane Directorate.

NOTE: The request should be submitted directly to the Manager, Seattle Aircraft Certification Office (ACO), and a copy sent to the cognizant FAA Principal Inspector (PI). The PI will then forward comments orconcurrence to the ACO.

C. Special flight permits may be issued in accordance with FAR 21.197 and 21.199 to operate airplanes to a base in order to comply with the requirements of this AD.

All persons affected by this directive who have not already received the appropriate service documents from the manufacturer may obtain copies upon request to Boeing Commercial Airplanes, P.O. Box 3707, Seattle, Washington 98124. These documents may be examined at the FAA, Northwest Mountain Region, Transport Airplane Directorate, 1601 Lind Avenue, S.W., Renton, Washington.

This amendment (39-6695, AD 90-17-07) becomes effective on September 17, 1990.

## Affected data sheets (1) (OpenAirDocs)

The type certificate data sheets whose models the AD names.

- [TCDS A20WE](https://openairdocs.org/tcds/A20WE): The Boeing Company; names 1 of 14 models: 747-400 Series

## Registered aircraft it may apply to (OpenAirDocs)

Matched by airframe and engine model; the AD's applicability may narrow it by serial number, part number or equipment.

- Aircraft: 38 (38 by airframe model, 0 by engine model)
- Makers: Boeing 38

Models with the most aircraft:

- [Boeing 747-446](https://openairdocs.org/model/boeing-747-446): 10 aircraft (airframe model)
- [Boeing 747-422](https://openairdocs.org/model/boeing-747-422): 8 aircraft (airframe model)
- [Boeing 747-412](https://openairdocs.org/model/boeing-747-412): 5 aircraft (airframe model)
- [Boeing 747-409](https://openairdocs.org/model/boeing-747-409): 4 aircraft (airframe model)
- [Boeing 747-481](https://openairdocs.org/model/boeing-747-481): 3 aircraft (airframe model)
- [Boeing 747-443](https://openairdocs.org/model/boeing-747-443): 2 aircraft (airframe model)
- [Boeing 747-438](https://openairdocs.org/model/boeing-747-438): 2 aircraft (airframe model)
- [Boeing 747-428](https://openairdocs.org/model/boeing-747-428): 2 aircraft (airframe model)
- [Boeing 747-400](https://openairdocs.org/model/boeing-747-400): 1 aircraft (airframe model)
- [Boeing 747-451](https://openairdocs.org/model/boeing-747-451): 1 aircraft (airframe model)

All 10 models: https://openairdocs.org/ad/90-17-07/models.md
Every aircraft: https://openairdocs.org/ad/90-17-07/aircraft.md

Its text cites no advisory circulars or STCs.

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