# AD 48-05-01: Oil Shutoff Valve 'O' Rings

- Type: Airworthiness directive
- Status: Current
- Products: Boeing DC3-G102, DC3-G102A, DC3-G103A, DC3-G202A, DC3A-S1C3G, DC3A-S1CG, DC3A-S4C4G, DC3A-SC3G, DC3A-SCG, DC3C-R-1830-90C, DC3C-S1C3G, DC3C-S4C4G and 2 more
- Superseded by: Nothing supersedes this AD
- Product type: Aircraft, Large airplane
- Registered aircraft: 61 may be affected, by airframe or engine model (OpenAirDocs)
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/83240423249A9843862569BC005061C6.0001
- DRS record last changed: May 30, 2024
- Page: https://openairdocs.org/ad/48-05-01

## The airworthiness directive

48-05-01 DOUGLAS: Applies to All DC3 Aircraft Equipped With Pacific Aviation Oil Shutoff Valves.

Compliance required at first engine change after March 1, 1948, but not later than May 1, 1948.

Replace the present "O" rings in the oil shutoff valves with rings of H222-90 high temperature material or AMS-3228B material. There has been reported leakage attributed to the fact that the material in the "O" rings is not capable of withstanding the operating temperature of the oil.

(Douglas Service Bulletin DC3 No. 256 covers this same subject.)

## Affected data sheets (2) (OpenAirDocs)

The type certificate data sheets whose models the AD names.

- [TCDS A-669](https://openairdocs.org/tcds/A-669): The Boeing Company; names 10 of 10 models: DC3C-S4C4G, DC3C-R-1830-90C, DC3A-S1C3G, DC3C-SC3G, DC3C-S1C3G, DC3A-SCG, DC3A-SC3G, DC3A-S1CG…
- [TCDS A-618](https://openairdocs.org/tcds/A-618): The Boeing Company; names 4 of 4 models: DC3-G202A, DC3-G102A, DC3-G103A, DC3-G102

## 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: 61 (61 by airframe model, 0 by engine model)
- Makers: Douglas 61

Models with the most aircraft:

- [Douglas DC3C-S1C3G](https://openairdocs.org/model/douglas-dc3c-s1c3g): 30 aircraft (airframe model)
- [Douglas DC3C-R-1830-90C](https://openairdocs.org/model/douglas-dc3c-r-1830-90c): 10 aircraft (airframe model)
- [Douglas DC3-G202A](https://openairdocs.org/model/douglas-dc3-g202a): 7 aircraft (airframe model)
- [Douglas DC-3A-S1C3G](https://openairdocs.org/model/douglas-dc-3a-s1c3g): 5 aircraft (airframe model)
- [Douglas DC3C-S4C4G](https://openairdocs.org/model/douglas-dc3c-s4c4g): 5 aircraft (airframe model)
- [Douglas DC3A-S4C4G](https://openairdocs.org/model/douglas-dc3a-s4c4g): 2 aircraft (airframe model)
- [Douglas DC3-G102A](https://openairdocs.org/model/douglas-dc3-g102a): 1 aircraft (airframe model)
- [Douglas DC3C-SC3G](https://openairdocs.org/model/douglas-dc3c-sc3g): 1 aircraft (airframe model)

All 8 models: https://openairdocs.org/ad/48-05-01/models.md
Every aircraft: https://openairdocs.org/ad/48-05-01/aircraft.md

Its text cites no advisory circulars or STCs.

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