# AD 63-08-03: Deboost Control System

- Type: Airworthiness directive
- Status: Current
- Products: Lockheed Martin 188A and 188C
- Effective: May 9, 1963
- Superseded by: Nothing supersedes this AD
- Product type: Aircraft, Large airplane
- Registered aircraft: 4 may be affected, by airframe or engine model (OpenAirDocs)
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/6549C48D1B44D4F9862569B6005BADA5.0001
- DRS record last changed: May 30, 2024
- Page: https://openairdocs.org/ad/63-08-03

## The airworthiness directive

63-08-03 LOCKHEED: Amdt. 553 Part 507 Federal Register April 9, 1963. Applies to All Model 188 Series Aircraft.

Compliance required as indicated.

To eliminate the possibility of fouling the deboost control systems, accomplish the following within 650 hours' time in service after the effective date of this AD, unless previously accomplished.

  (a) Modify all aircraft by installing deflectors on the rudder and elevator spring cartridges and by chamfering corners of the aileron and elevator spring cartridges to eliminate sharp edges and projections in the area of the "off" branch cables in accordance with Lockheed Service Information Letter 881 SIL-30, dated December 29, 1961, or FAA approved equivalent.

  (b) Modify those aircraft which incorporate the provisions of Service Bulletin 88/SB- 547, dated August 4, 1961, by inverting the screw and nut that attach the left-hand fuel dump chute locking cable conduit tube to the floor support below the pilot's lower center consolecontrol box, in accordance with the -1 PS of Lockheed Drawing 840850.

(Lockheed Service Information Letter 88/SIL-30, dated December 29, 1961, and revision to Lockheed Service Bulletin 547, dated March 28, 1962, cover this same subject.)

This directive effective May 9, 1963.

## Affected data sheets (1) (OpenAirDocs)

The type certificate data sheets whose models the AD names.

- [TCDS 4A22](https://openairdocs.org/tcds/4A22): Lockheed Martin Corporation; names 2 of 2 models: 188A, 188C

## 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: 4 (4 by airframe model, 0 by engine model)
- Makers: Lockheed 4

Models with the most aircraft:

- [Lockheed 188C](https://openairdocs.org/model/lockheed-188c): 3 aircraft (airframe model)
- [Lockheed 188A](https://openairdocs.org/model/lockheed-188a): 1 aircraft (airframe model)

All 2 models: https://openairdocs.org/ad/63-08-03/models.md
Every aircraft: https://openairdocs.org/ad/63-08-03/aircraft.md

Its text cites no advisory circulars or STCs.

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