# AD 64-08-01: Pitot And Static Line Fittings

- 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: April 2, 1964
- Published: April 2, 1964
- Superseded by: Nothing supersedes this AD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/843AECAA91768CEF862569BD004D0A1D.0001
- DRS record last changed: May 30, 2024
- Page: https://openairdocs.org/ad/64-08-01

## The airworthiness directive

64-08-01 DOUGLAS: Amdt. 710 Part 507 Federal Register April 2, 1964. Applies to All Models DC-8 and DC-8F Series Aircraft.

Compliance required as indicated.

It has been found that excessive torquing of pilot and static line fittings of the pitch trim compensator and the use of a nonreinforced hose can result in the twisting or bending of the pitot and/or static lines and the possible loss of required instruments. To correct this condition, accomplish either (a) or (b) as follows:

  (a) Within 300 hours time in service after the effective date of this AD, modify the pitch trim compensator system in accordance with the provisions of paragraph (c).

  (b) Accomplish the provisions specified in (1), (2) and (3) and in addition, within 1,500 hours' time in service after the effective date of this AD modify the pitch trim compensator in accordance with the provisions of paragraph (c).

  (1) Within 300 hours time in service after the effective date of this AD, unless already accomplished, visually inspect all aircraft for any evidence of bending or twisting of the pitot and static lines associated with the pitch trim compensator in accordance with the Douglas "Pitot Static System Inspection-DC-8" Service Letter CL-78-1966/DEG8-34-15-0 dated November 15, 1963.

  (2) Replace any damaged lines before further flight.

  (3) Each time the pitot and static line fittings associated with the pitch trim compensator are removed, loosened or retightened, visually inspect the pitot-static lines associated with the pitch trim compensator for any evidence of bending or twisting in accordance with the Douglas "Pitot Static System Inspection - DC-8" Service Letter CL-78-1966/DEG 8-34-15-0 dated November 15, 1963.

  (c) Modify the pitch trim compensator system by replacing the pitot and static lines with reinforced lines and securing the pitot and static line fittings in accordance with paragraph 2, Accomplishment Instructions of the Douglas DC-8 Service BulletinNo. 34-51 dated January 9, 1964, or an FAA Western Region, Engineering and Manufacturing Branch approved equivalent.

(Douglas DC-8 Service Bulletin No. 34-51 dated January 9, 1964, and Douglas DC-8 Service Letter CL-78-1966/DEG 8-34-15-0 dated November 15, 1963, pertain to this AD.)

This directive effective April 2, 1964.

## 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/64-08-01/models.md
Every aircraft: https://openairdocs.org/ad/64-08-01/aircraft.md

Its text cites no advisory circulars or STCs.

---
OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). It is not affiliated with the FAA or the NTSB. Source documents are U.S. government works in the public domain.