# AD 68-23-01: Cabin Superchargers

- Type: Airworthiness directive
- Status: Current
- Products: British Aerospace Argosy AW.650 Series 101, F27 Mark 100, F27 Mark 300, Cabin Superchargers, G-159, F-27, F-27A, F-27B, F-27F, F-27G, F-27J, F-27M and 9 more
- Effective: November 21, 1968
- Superseded by: Nothing supersedes this AD
- Product type: Appliance
- Amendment: 39-673
- Registered aircraft: 6 may be affected, by airframe or engine model (OpenAirDocs)
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/894FC06468D20D4F86256A3300423394.0001
- DRS record last changed: May 30, 2024
- Page: https://openairdocs.org/ad/68-23-01

## The airworthiness directive

68-23-01 GODFREY: Amendment 39-673. Applies to Godfrey Cabin Superchargers Type 15 Marks 6, 9, and 14, installed on, but not necessarily limited to, British Aircraft Corporation Viscount Models 744, 745D, and 810; Armstrong Whitworth Arogsy AW-650; Fokker F-27 Marks 100 and 300; Fairchild Hiller Models F27 and FH227 all series; Nihon Model YS-11; and Grumman Model G159 airplanes.

Compliance required as indicated.

To prevent the loss of oil from the Godfrey Cabin Compressor due to the oil metering unit or bearing covering plate becoming loose, accomplish the following unless already accomplished:

  (a) For British Aircraft Corporation Viscount Models 744, 745D and 810 airplanes -

Within the next 50 hours' time in service after the effective date of this AD and thereafter at intervals whenever the gear box oil contents are checked, inspect the oil metering unit and bearing cover plate for security, i.e., nuts are tight and spring washers fully compressed. Secure asnecessary.

  (b) For all the applicable airplanes -

At the next overhaul of the Supercharger or within the next 1500 hours' time in service, whichever occurs earlier, after the effective date of this AD, replace and lockwire the oil metering unit and bearing cover retaining nuts, in accordance with Godfrey Precision Products, Ltd. Service Bulletin No. 21-116-1195, Revision 2, dated February 1, 1968, or later ARB - approved revision or an equivalent approved by the Chief, Aircraft Certification Staff, FAA, Europe, Africa and Middle East Region.

  (c) The repetitive inspections required by paragraph (a) may be discontinued following the incorporation of the modification required by paragraph (b).

This amendment becomes effective November 21, 1968.

## Affected data sheets (6) (OpenAirDocs)

The type certificate data sheets whose models the AD names.

- [TCDS 7A1](https://openairdocs.org/tcds/7A1): Maryland Air Industries Inc.; names 12 of 12 models: FH-227B, FH-227C, FH-227D, F-27, F-27A, F-27M, F-27J, FH-227E…
- [TCDS A-814](https://openairdocs.org/tcds/A-814): Vickers-Armstrongs (Aircraft Limited); names 3 of 3 models: Viscount 810, Viscount 744, Viscount 745D
- [TCDS A-817](https://openairdocs.org/tcds/A-817): Fokker Services B.V.; names 2 of 8 models: F27 Mark 100, F27 Mark 300
- [TCDS 1A17](https://openairdocs.org/tcds/1A17): Gulfstream Aerospace Corporation; names 1 of 1 models: G-159
- [TCDS 7A9](https://openairdocs.org/tcds/7A9): British Aerospace (Commercial Aircraft) Ltd; names 1 of 1 models: Argosy AW.650 Series 101
- [TCDS A1PC](https://openairdocs.org/tcds/A1PC): Mitsubishi Heavy Industries Ltd.; names 1 of 5 models: YS-11

## 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: 6 (6 by airframe model, 0 by engine model)
- Makers: Grumman 4, Fairchild 1, Grumman American Avn. 1

Models with the most aircraft:

- [Grumman G-159](https://openairdocs.org/model/grumman-g-159): 4 aircraft (airframe model)
- [Fairchild F-27F](https://openairdocs.org/model/fairchild-f-27f): 1 aircraft (airframe model)
- [Grumman American Avn. G-159](https://openairdocs.org/model/grumman-american-avn-g-159): 1 aircraft (airframe model)

All 3 models: https://openairdocs.org/ad/68-23-01/models.md
Every aircraft: https://openairdocs.org/ad/68-23-01/aircraft.md

Its text cites no advisory circulars or STCs.

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