# AD 62-21-01: Oil Temperature Indicating System

- Type: Airworthiness directive
- Status: Current
- Products: Bombardier CL-44D4
- Effective: October 29, 1962
- Superseded by: Nothing supersedes this AD
- Product type: Aircraft, Large airplane
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/F7F55FCF7FCE12AA862569A70059A1D5.0001
- DRS record last changed: May 30, 2024
- Page: https://openairdocs.org/ad/62-21-01

## The airworthiness directive

62-21-01 CANADAIR: Amdt. 488 Part 507 Federal Register September 27, 1962. Applies to all Model CL-44D4 aircraft equipped with Rolls Royce Tyne Engines.

Compliance required within the next 350 hours' time in service after the effective date of this AD.

To preclude bearing failure resulting from sludge deposited in oil ways which feed the high pressure turbine bearing, accomplish the following:

  (a) Install high pressure turbine bearing scavenge oil temperature indicating system in accordance with Rolls Royce Modification 959 (Service Bulletin Ty72-384) and Canadair Service Information Circular No. 216-CL44D4.

  (b) If the oil flow through the scavenge line has not been checked within 100 hours prior to the installation of the temperature indicating system specified in (a), check the oil flow in accordance with the procedures outlined in Sections 2A and 2B of Rolls Royce Alert Service Bulletin No. A-Ty79-15 at the time the temperature indicating system is installed.(c) Appropriate changes to the airplane flight manual shall be made covering the applicable provisions of Section 2D of Service Bulletin A-Ty79-15 regarding feathering of an engine if the turbine bearing scavenge oil corrected temperature exceeds 180 degrees C. during cruise.

  (d) When the oil temperature indicating system is installed per paragraph (a) the inspections required in AD 62-9-2 as amended, may be discontinued.

This directive effective October 29, 1962.

## Affected data sheets (1) (OpenAirDocs)

The type certificate data sheets whose models the AD names.

- [TCDS 1A20](https://openairdocs.org/tcds/1A20): Bombardier Inc.; names 1 of 2 models: CL-44D4

## Registered aircraft it may apply to (OpenAirDocs)

No registered aircraft matched the models it names.

Its text cites no advisory circulars or STCs.

---
OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). It is not affiliated with the FAA or the NTSB. Source documents are U.S. government works in the public domain.