# AD 79-03-03: Engine Oil Pressure

- Type: Airworthiness directive
- Status: Current
- Products: Cessna T207A, T210M and TU206G
- Effective: February 12, 1979
- Superseded by: Nothing supersedes this AD
- Product type: Aircraft, Small airplane
- Amendment: 39-3406
- Registered aircraft: 572 may be affected, by airframe or engine model (OpenAirDocs)
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/E18B035B4404B75186256A34006AA714.0001
- DRS record last changed: May 30, 2024
- Page: https://openairdocs.org/ad/79-03-03

## The airworthiness directive

79-03-03 CESSNA: Amendment 39-3406. Applies to Model TU206G (S/Ns U20604459, U20604465, U20604473, U20604474, U20604480, U20604482 thru U20604484, U20604486, U20604487, U20604491, U20604493, U20604507, U20604567), Model T207A (S/Ns 20700453, 20700455, 20700456), and Model T210M (S/Ns 21062673, 21062699 thru 21062702, 21062704 thru 21062708, 21062711, 21062712, 21062715, 21062717 thru 21062722, 21062724, 21062726, 21062728 thru 21062730, 21062732, 21062734 thru 21062736, 21062738 thru 21062741, 21062746, 21062747 thru 21062752, 21062766, 21062767, 21062818) airplanes certificated in all categories.

COMPLIANCE: Required as indicated unless already accomplished.

To preclude failure of the engine oil pressure and scavenge pump drive shaft and resulting oil pressure loss caused by turbocharger oil scavenge pump ingestion of failed turbocharger thrust bearing anti-rotation pins, within the next 10 hours' time-in-service after the effective date of this AD, accomplish the following:

A) Check the Cessna P/N C295001-0101 (AiResearch P/N 406610-5) turbocharger nameplate to determine if the serial number is HE0101 through HE0160.

B) If the serial number on the turbocharger nameplate is not one of those specified in Paragraph A), make an entry in the aircraft maintenance records indicating compliance with this AD and no further action is required.

C) If the serial number on the turbocharger nameplate is one of those specified in Paragraph A), replace the turbocharger or replace the turbocharger center housing in accordance with applicable Cessna or AiResearch service instructions.

D) Airplanes may be flown in accordance with FAR 21.197 to a location where replacement required by Paragraph C) may be accomplished.

E) Any equivalent method of compliance with this AD must be approved by the Chief, Engineering and Manufacturing Branch, FAA, Central Region.

This amendment becomes effective on February 12, 1979 to all persons except thoseto whom it has already been made effective by an airmail letter from the FAA dated December 21, 1978.

## Affected data sheets (3) (OpenAirDocs)

The type certificate data sheets whose models the AD names.

- [TCDS 3A21](https://openairdocs.org/tcds/3A21): Textron Aviation Inc.; names 1 of 28 models: T210M
- [TCDS A16CE](https://openairdocs.org/tcds/A16CE): Textron Aviation Inc.; names 1 of 4 models: T207A
- [TCDS A4CE](https://openairdocs.org/tcds/A4CE): Textron Aviation Inc.; names 1 of 29 models: TU206G

## 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: 572 (572 by airframe model, 0 by engine model)
- Makers: Cessna 572

Models with the most aircraft:

- [Cessna T210M](https://openairdocs.org/model/cessna-t210m): 321 aircraft (airframe model)
- [Cessna TU206G](https://openairdocs.org/model/cessna-tu206g): 207 aircraft (airframe model)
- [Cessna T207A](https://openairdocs.org/model/cessna-t207a): 44 aircraft (airframe model)

All 5 models: https://openairdocs.org/ad/79-03-03/models.md
Every aircraft: https://openairdocs.org/ad/79-03-03/aircraft.md

Its text cites no advisory circulars or STCs.

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