# AD 61-06-05: Rudder Boost Piston Locknut

- Type: Airworthiness directive
- Status: Current
- Products: Boeing DC-8-11, DC-8-12, DC-8-21, DC-8-31, DC-8-32, DC-8-33, DC-8-41, DC-8-42, DC-8-43, DC-8-51, DC-8-52, DC-8-53 and 15 more
- Effective: March 23, 1961
- Published: March 23, 1961
- Superseded by: Nothing supersedes this AD
- Product type: Aircraft, Large airplane
- Registered aircraft: 8 may be affected, by airframe or engine model (OpenAirDocs)
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/B42A5BD02A428A28862569BC0073E22D.0001
- DRS record last changed: May 30, 2024
- Page: https://openairdocs.org/ad/61-06-05

## The airworthiness directive

61-06-05 DOUGLAS: Amdt. 270 Part 507 Federal Register March 23, 1961. Applies to All DC-8 Series Aircraft.

Compliance required within the next 20 hours' time in service, unless already accomplished in accordance with Douglas Alert Bulletin dated February 24, 1961.

As a result of reported instances of loosened rudder boost piston end assembly locknut, the following must be accomplished.

Refer to DC-8 Overhaul Manual, Chapter 27-19-2, page 18. Visually inspect for loose locknut P/N NAS 509-16 and proper installation and safetying to locknut of lockwasher P/N NAS 513-16. Insure that lockwasher is not installed backwards and that tang on lockwasher is engaged in notch in piston end and that piston has not rotated out of its proper position. If any discrepancies are found, they must be corrected in accordance with the DC-8 Overhaul Manual and Douglas Alert Bulletin dated February 24, 1961, prior to further flight.

This directive becomes effective upon publicationin the Federal Register for all person except those to whom it was made effective immediately by individual telegrams dated March 8, 1961.

## Affected data sheets (1) (OpenAirDocs)

The type certificate data sheets whose models the AD names.

- [TCDS 4A25](https://openairdocs.org/tcds/4A25): The Boeing Company; names 27 of 27 models: DC-8-41, DC-8-52, DC-8-61, DC-8-53, DC-8-51, DC-8-63, DC-8-11, DC-8-72F…

## 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: 8 (8 by airframe model, 0 by engine model)
- Makers: Douglas 5, Mcdonnell Douglas 3

Models with the most aircraft:

- [Douglas DC-8-73](https://openairdocs.org/model/douglas-dc-8-73): 2 aircraft (airframe model)
- [Douglas DC-8-73F](https://openairdocs.org/model/douglas-dc-8-73f): 2 aircraft (airframe model)
- [Mcdonnell Douglas DC-8-62](https://openairdocs.org/model/mcdonnell-douglas-dc-8-62): 1 aircraft (airframe model)
- [Mcdonnell Douglas DC-8-63](https://openairdocs.org/model/mcdonnell-douglas-dc-8-63): 1 aircraft (airframe model)
- [Mcdonnell Douglas DC-8-63F](https://openairdocs.org/model/mcdonnell-douglas-dc-8-63f): 1 aircraft (airframe model)
- [Douglas DC-8-72](https://openairdocs.org/model/douglas-dc-8-72): 1 aircraft (airframe model)

All 6 models: https://openairdocs.org/ad/61-06-05/models.md
Every aircraft: https://openairdocs.org/ad/61-06-05/aircraft.md

Its text cites no advisory circulars or STCs.

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