# AD 70-13-03: Hydraulic Lock

- Type: Airworthiness directive
- Status: Current
- Products: Continental Motors TSIO-520-C
- Effective: July 2, 1970
- Superseded by: Nothing supersedes this AD
- Product type: Engine
- Amendment: 39-1017
- Registered aircraft: 4,130 may be affected, by airframe or engine model (OpenAirDocs)
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/BC83DCA83284CE6E8625682C006BCCB8.0001
- DRS record last changed: May 30, 2024
- Page: https://openairdocs.org/ad/70-13-03

## The airworthiness directive

70-13-03 CONTINENTAL: Amendment 39-1017. Applies to Continental Model TSIO-520-C (Serial Numbers 140001 through 140678) engines installed in Cessna Model TU206, TP206 and T210 airplanes. Compliance: Unless already accomplished, within the next 12 months after the effective date of this AD, accomplish the following: To prevent hydraulic lock and resulting engine damage and power loss: Replace the presently installed Teledyne Continental Motors Part Number 633125 balance tube assembly with new Teledyne Continental Motors Part Number 635645 balance tube assembly and install associated aircraft installation drainage provisions in accordance with Cessna Service Kit SK206-10, or an equivalent method approved by the Chief, Engineering and Manufacturing Branch, FAA, Central Region, Kansas City, Missouri. Teledyne Continental Motors Service Bulletin M70-5 dated May 6, 1970, also pertains to this subject. This amendment becomes effective July 2, 1970.

## Affected data sheets (1) (OpenAirDocs)

The type certificate data sheets whose models the AD names.

- [TCDS E8CE](https://openairdocs.org/tcds/E8CE): Continental Aerospace Technologies, Inc.; names 1 of 31 models: TSIO-520-C

## 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: 4,130 (0 by airframe model, 4,130 by engine model)
- Makers: Cessna 3,195, Beech 672, Piper 173, Raytheon 61, Mooney 11, Navion 3, Meyers Industries 2, Ryan 2, Aero Commander 1, Cirrus Design 1

Models with the most aircraft:

- [Continental TSIO-520 series](https://openairdocs.org/engine/continental-tsio-520-series): 4,064 aircraft (engine model)
- [TCM Cont TSIO-520 series](https://openairdocs.org/engine/tcm-cont-tsio-520-series): 49 aircraft (engine model)
- [Continental TSIO-520-C](https://openairdocs.org/engine/continental-tsio-520-c): 17 aircraft (engine model)

All 3 models: https://openairdocs.org/ad/70-13-03/models.md
Every aircraft: https://openairdocs.org/ad/70-13-03/aircraft.md

Its text cites no advisory circulars or STCs.

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