SCHEDULE OF AIRWORTHINESS DIRECTIVES
CESSNA 421C · Airworthiness Directives
Overview
This document is a schedule of airworthiness directives issued by the Civil Aviation Safety Authority of Australia, specifically addressing the Cessna 400 Series aeroplanes. It outlines the requirements for inspecting and maintaining the engine exhaust systems of various models within the series, including the Cessna 421. Notably, the directive states that the Cessna 421C model has been excluded from the applicability of this directive due to its modified exhaust system, which is not subject to the defects addressed. The document serves as a compliance guide for operators of the Cessna 400 Series, detailing inspection intervals and procedures necessary to ensure airworthiness.
- The directive applies to Cessna 400 Series models except for the Cessna 421C.
- Inspection of engine exhaust systems is required at intervals of 50, 100, and 750 hours.
- Cessna SIL ME75-17 and ME79-32 provide detailed inspection and replacement procedures.
- The Cessna 421C has a modified exhaust system and is not subject to this directive.
- The directive became effective on December 4, 1997.
Document
Source
Originally published by services.casa.gov.au. Sprinkle hosts a reference copy with an added summary, specifications and searchable full text.
Document details
- Type
- Airworthiness Directives
- Year
- 1997
- Pages
- 1
- File size
- 11 KB
- Publisher
- services.casa.gov.au
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In this document
Applicability
The airworthiness directive applies to all models in the Cessna 400 Series, specifically the 401, 401A, 401B, 402, 402A, 402B, 414, 414A, 421, 421A, and 421B series aeroplanes. However, it explicitly states that the Cessna 421C is not included due to its modified exhaust system.
Requirements
Operators are required to inspect the engine exhaust system assemblies according to specific Cessna Service Information Letters (SILs). This includes inspecting components and replacing certain exhaust clamps as outlined in the referenced SILs.
Compliance
The compliance intervals for inspections are set at not exceeding 50 hours, 100 hours, and 750 hours of time in service, depending on the specific requirement.
Background
The background section notes that the amendment to the directive removes the Cessna 421C from the applicability list, indicating that this model has a modified exhaust system that does not have the defects addressed by the directive.
Full document text
COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY SCHEDULE OF AIRWORTHINESS DIRECTIVES Cessna 400 Series Aeroplanes AD/CESSNA 400/43 Amdt 8 Engine Exhaust System 13/97 Applicabilility: All model 401, 401A, 401B,402,402A,402B,414,414A,421,421A and 421B series aeroplanes. Requirement: 1. Inspect applicable aircraft engine exhaust system assemblies in accordance with the provisions of Cessna SIL ME75-17 and Cessna SIL ME79-32. 2. Inspect exhaust system components in accordance with the provisions of Table II of Cessna SIL No. ME79-32. 3. Replace multi-segment ‘V’ band exhaust clamps listed in Table III of Cessna SIL No. ME79-32. Note: FAA AD 75-23-08 R5 Amdt 39-5451 refers. Compliance: 1. At intervals not exceeding 50 hours time in service. 2. At intervals not exceeding 100 hours time in service. 3. At intervals not exceeding 750 hours time in service. This airworthiness directive becomes effective on 4 December 1997. Background: This amendment deletes the 421C series aeroplane from the AD applicability. This model aircraft has a modified exhaust system which is not subject to the defects addressed by this directive. Amendment 7 of this airworthiness directive became effective on 20 August 1992. Amendment 6 of this airworthiness directive became effective on 12 March 1987. The original issue of this airworthiness directive became effective on 31 March 1975.
What's in the CESSNA 421C TCDS
A Type Certificate Data Sheet (TCDS) is the FAA's record of what an aircraft type was approved as. It is the source of truth for weights, seating, fuel and the rules the design was certified against. Expand any line to see what it means.
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