# AD 77-12-04: Upper Cargo Door

- Type: Airworthiness directive
- Status: Current
- Products: Boeing DC-10-10F and DC-10-30F (KC-10A, KDC-10)
- Effective: July 22, 1977
- Superseded by: Nothing supersedes this AD
- Product type: Aircraft, Large airplane
- Amendment: 39-2921
- Registered aircraft: 14 may be affected, by airframe or engine model (OpenAirDocs)
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/D950405DBB286C21862569CA004A8F5F.0001
- DRS record last changed: May 30, 2024
- Page: https://openairdocs.org/ad/77-12-04

## The airworthiness directive

77-12-04 MCDONNELL DOUGLAS: Amendment 39-2921. Applies to Model DC-10-10F and DC-10-30F airplanes certificated in all categories.

Compliance required within the next 1000 hours time in service after the effective date of this AD, unless already accomplished.

To reduce the possibility that operational errors could result in dispatch of an aircraft with the upper cargo door unlatched or unlocked, accomplish (a) and either (b) or (c) as follows:

  (a) Install a lock mechanism viewing window on the upper cargo door and add a new instruction placard per McDonnell Douglas DC-10 Service Bulletin No. 52-120, dated September 4, 1974, or later FAA approved revision.

  (b) Install an upper cargo door vent door with integral blockers for the torque tube and lock tube and add instruction placard per McDonnell Douglas DC-10 Service Bulletin No. 52-137, dated July 9, 1976, or later FAA approved revision, or

  (c) After each operation of the upper cargo door, prior to flight verify that the door is flush with the fuselage, that lock pin engagement has occurred by observing through the viewing port, and secure the upper cargo door by accomplishing (1) and either (2) or (3) as follows:

  (1) Install bolt (NAS 6304-17 or NAS 6404U17) with locknut in lieu of pip pin in lock tube hole.

  (2) Open and secure with positive lock-out devices, the upper cargo door power circuit breakers (B1-1341, B1-1342, and B1-1343) located on the flight engineer's lower main circuit breaker panel and "upper cargo door power control" circuit breaker (B1-1340) located on the forward left cabin equipment panel; or

  (3) Remove or hydraulically disconnect lock tube actuator (P/N 477667-5503).

  (d) Equivalent modifications may be used when approved by the Chief, Aircraft Engineering Division, FAA Western Region.

  (e) Special flight permits may be issued in accordance with FAR's 21.197 and 21.199 to operate airplanes to base for the accomplishment of the modificationsrequired by this AD.

This amendment becomes effective July 22, 1977.

## Affected data sheets (1) (OpenAirDocs)

The type certificate data sheets whose models the AD names.

- [TCDS A22WE](https://openairdocs.org/tcds/A22WE): The Boeing Company; names 2 of 11 models: DC-10-10F, DC-10-30F (KC-10A KDC-10)

## 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: 14 (14 by airframe model, 0 by engine model)
- Makers: Mcdonnell Douglas 13, Douglas 1

Models with the most aircraft:

- [Mcdonnell Douglas DC-10-30F](https://openairdocs.org/model/mcdonnell-douglas-dc-10-30f): 12 aircraft (airframe model)
- [Douglas DC-10-30F](https://openairdocs.org/model/douglas-dc-10-30f): 1 aircraft (airframe model)
- [Mcdonnell Douglas DC-10-30F (KDC-10)](https://openairdocs.org/model/mcdonnell-douglas-dc-10-30f-kdc-10): 1 aircraft (airframe model)

All 3 models: https://openairdocs.org/ad/77-12-04/models.md
Every aircraft: https://openairdocs.org/ad/77-12-04/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.