# AD 74-18-01: Inertial Navigation System

- Type: Airworthiness directive
- Status: Current
- Products: Boeing DC-10-10, DC-10-10F, DC-10-30, DC-10-30F (KC-10A, KDC-10) and DC-10-40
- Effective: March 8, 1976
- Superseded by: Nothing supersedes this AD
- Product type: Aircraft, Large airplane
- Amendment: 39-2533
- Registered aircraft: 25 may be affected, by airframe or engine model (OpenAirDocs)
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/F2587FC350BC843186256E0C0071FE15.0001
- DRS record last changed: May 30, 2024
- Page: https://openairdocs.org/ad/74-18-01

## The airworthiness directive

74-18-01 MCDONNELL DOUGLAS: Amendment 39-1927 as amended by Amendment 39-2533. Applies to all Douglas Aircraft Company DC-10-10/-30/-40 Series airplanes which incorporate Douglas DC-10 Service Bulletin 21-68 or Service Change 1545 when inertial navigation systems are installed.

Compliance required as indicated, unless previously accomplished.

Within 300 additional hours time in service after the effective date of this AD, either

  (1) Incorporate in the FAA-approved Airplane Flight Manual, Documents MDC-J1010, MDC-J1030, MDC-J5830, MDC-J1040, and Appendix X of MDC-J1010, the following revision in Section I, Limitations, under the existing heading 'Cabin Pressurization':

'For the inertial platform configured airplanes, temporary installation of wiring per Douglas Drawing WBP 9502 must be accomplished for planned unpressurized flight'; or

  (2) Incorporate other airplane flight manual revisions, and/or equipment modification approved by the Chief, Aircraft Engineering Division, FAA Western Region.

Amendment 39-1927 became effective August 26, 1974.

This amendment 39-2533 becomes effective March 8, 1976.

## 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 5 of 11 models: DC-10-40, DC-10-10F, DC-10-30, DC-10-30F (KC-10A KDC-10), DC-10-10

## 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: 25 (25 by airframe model, 0 by engine model)
- Makers: Mcdonnell Douglas 13, Douglas 7, Mcdonnell-Douglas 5

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-10-40](https://openairdocs.org/model/douglas-dc-10-40): 6 aircraft (airframe model)
- [Mcdonnell-Douglas DC-10-30](https://openairdocs.org/model/mcdonnell-douglas-dc-10-30): 5 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 5 models: https://openairdocs.org/ad/74-18-01/models.md
Every aircraft: https://openairdocs.org/ad/74-18-01/aircraft.md

Its text cites no advisory circulars or STCs.

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