# AD 78-23-05: Spline Wear On Elevator Travel

- Type: Airworthiness directive
- Status: Current
- Products: Bombardier CL-44D4 and CL-44J
- Effective: November 10, 1978
- Superseded by: Nothing supersedes this AD
- Product type: Aircraft, Large airplane
- Amendment: 39-3338
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/0FF49E6C050EB40C862569A7006651BA.0001
- DRS record last changed: May 30, 2024
- Page: https://openairdocs.org/ad/78-23-05

## The airworthiness directive

78-23-05 CANADAIR: Amendment 39-3338. Applies to CL-44D4 and CL-44J airplanes, certificated in all categories.

To preclude loss of elevator travel due to spline wear;

  (a) Within the next 100 hours in service after the effective date of this airworthiness directive, unless already accomplished within the last 900 hours in service, and thereafter at intervals not to exceed 1000 hours in service, accomplish the following:

  (1) Visually inspect each elevator resilient stop mechanism at spanwise stations 43 and 178 for wear, in accordance with Inspection Data paragraph of Canadair Service Information Circular (SIC) Number 406-CL44, dated May 17, 1977, or equivalent.

  (2) Prior to next flight, repair or replace worn parts with parts of the same part number and install in accordance with instructions outlined in Chapter 55-20-2 of the Canadair CL-44 Overhaul Manual, dated June 19, 1964, or equivalent.

  (b) Equivalent inspections and repairs must be approved by the Chief, Engineering and Manufacturing Branch, FAA, Eastern Region.

  (c) Upon submission of substantiating data by an owner or operator through an FAA Maintenance Inspector, the Chief, Engineering and Manufacturing Branch, FAA, Eastern Region, may adjust the compliance times specified in this AD.

This amendment is effective November 10, 1978.

## 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 2 of 2 models: CL-44D4, CL-44J

## Registered aircraft it may apply to (OpenAirDocs)

No registered aircraft matched the models it names.

Its text cites no advisory circulars or STCs.

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