# AD 81-06-51 R1: Outboard Wing Inspection

- Type: Airworthiness directive
- Status: Current
- Products: Boeing 707-100 Long Body, 707-100B Long Body, 707-100B Short Body, 707-200, 707-300 Series, 707-300B Series, 707-300C Series, 707-400 Series, 720 Series and 720B Series
- Effective: September 30, 1982
- Superseded by: Nothing supersedes this AD
- Product type: Aircraft, Large airplane
- Amendment: 39-4445
- Registered aircraft: 6 may be affected, by airframe or engine model (OpenAirDocs)
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/3A8BA8539AA3C0A8862568A5006F2FB5.0001
- DRS record last changed: May 30, 2024
- Page: https://openairdocs.org/ad/81-06-51-R1

## The airworthiness directive

81-06-51 R1 BOEING: Amendment 39-4110 as amended by Amendment 39-4445. Applies to Boeing Model 707/720 series airplanes, certificated in all categories, prior to line number 885. To assure continued structural integrity of the outboard wing, accomplish the following within the next 75 hours time-in-service unless accomplished since January 1, 1980:

1. Perform a one-time visual inspection and repeat visual inspections at intervals not exceeding one year, in accordance with Boeing Service Bulletin A3308, Revision 2, dated July 10, 1981, or later revision approved by the Manager, Seattle Area Aircraft Certification Office, FAA Northwest Mountain Region. The first repetitive inspection shall be accomplished within a year of the last inspection (AD 81-06-51) or within 90 days after the effective date of this amendment, whichever occurs later.

2. After inspection, spray the area with BMS 3-23 organic corrosion inhibitor or equivalent.

3. Parts found cracked must be repaired in accordance with Boeing Service Bulletin A3308 or replaced prior to further flight except that airplanes may be flown to a maintenance base for repairs or replacement in accordance with FAR 21.197 and 21.199 with prior approval of the Chief, Seattle Area Aircraft Certification Office, FAA Northwest Region.

4. Equivalent inspections and repairs may be used when approved by the Chief, Seattle Area Aircraft Certification Office, FAA Northwest Region.

The manufacturers specifications and procedures identified and described in this amendment are incorporated herein and made a part hereof pursuant to 5 U.S.C. 552(a)(1).

All persons affected by this directive who have not already received the service document from the manufacturer may obtain copies upon request to The Boeing Company, P.O. Box 3707, Seattle, Washington 98124. These documents also may be examined at FAA Northwest Mountain Region, 9010 East Marginal Way South, Seattle, Washington.

Amendment 39-4110 became effective May 18, 1981, and was effective earlier to those recipients of telegraphic AD T81-06-51, dated March 6, 1981.

This Amendment 39-4445 becomes effective September 30, 1982.

## Affected data sheets (3) (OpenAirDocs)

The type certificate data sheets whose models the AD names.

- [TCDS 4A21](https://openairdocs.org/tcds/4A21): The Boeing Company; names 4 of 4 models: 707-100B Short Body, 707-200, 707-100 Long Body, 707-100B Long Body
- [TCDS 4A26](https://openairdocs.org/tcds/4A26): The Boeing Company; names 4 of 4 models: 707-300B Series, 707-400 Series, 707-300 Series, 707-300C Series
- [TCDS 4A28](https://openairdocs.org/tcds/4A28): The Boeing Company; names 2 of 2 models: 720B Series, 720 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: 6 (6 by airframe model, 0 by engine model)
- Makers: Boeing 6

Models with the most aircraft:

- [Boeing 707-338C](https://openairdocs.org/model/boeing-707-338c): 2 aircraft (airframe model)
- [Boeing 707-368C](https://openairdocs.org/model/boeing-707-368c): 1 aircraft (airframe model)
- [Boeing 707-321B](https://openairdocs.org/model/boeing-707-321b): 1 aircraft (airframe model)
- [Boeing 707-323B](https://openairdocs.org/model/boeing-707-323b): 1 aircraft (airframe model)
- [Boeing 707-351B](https://openairdocs.org/model/boeing-707-351b): 1 aircraft (airframe model)

All 5 models: https://openairdocs.org/ad/81-06-51-R1/models.md
Every aircraft: https://openairdocs.org/ad/81-06-51-R1/aircraft.md

Its text cites no advisory circulars or STCs.

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