SCHEDULE OF AIRWORTHINESS DIRECTIVES
Beechcraft 76 Duchess · Airworthiness Directives
Overview
This document is a Schedule of Airworthiness Directives for the Beechcraft 76 Duchess Series Aeroplanes, specifically addressing the engine mount support structure. It outlines the requirements for visual inspections of the engine mount channels to ensure safety and compliance with aviation regulations. The directive applies to all models of the Beechcraft 76 and emphasizes the importance of regular inspections to prevent structural failures. It includes compliance timelines and background information on the directive's necessity due to reported failures in the engine mount channels.
- Visual inspections of engine mount channels are required for all Beechcraft 76 models.
- Inspect channels P/Nos. 105-980000 -19, -21, -23, -25 for cracks.
- Compliance is required within 100 hours of service after April 30, 1984.
- Subsequent inspections must occur at intervals not exceeding 100 hours.
- Defective mount channels must be repaired to an acceptable scheme.
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
- 1991
- Pages
- 1
- File size
- 11 KB
- Publisher
- services.casa.gov.au
Common. Rarer than 24% of the aircraft models we track.
Most owners only have the POH. Here's the essential set for the Beechcraft 76 Duchess.
- Pilot's Operating Handbook / AFM
- Checklist
- Maintenance Manual
- Parts Catalog (IPC)
- Systems & Wiring
- Service Bulletins
- Type Certificate (TCDS)
Free — save the 76 DUCHESS to your watchlist and track it in one place.
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In this document
Applicability
The directive applies to all models of the Beechcraft 76 Duchess series aeroplanes, ensuring that all aircraft within this category adhere to the specified inspection requirements.
Inspection Requirements
Pilots and maintenance personnel are required to visually inspect the engine mount channels with part numbers 105-980000 -19, -21, -23, and -25 for any cracks, particularly near the anchor nut that secures the engine mount bolt.
Compliance Timeline
The compliance for the inspection is set within 100 hours of time in service after April 30, 1984, or at the next scheduled inspection for Maintenance Release after that date, whichever comes first. Subsequent inspections must occur at intervals not exceeding 100 hours.
Background Information
This Airworthiness Directive was issued in response to reports of engine mount channel failures, necessitating a recurring inspection to ensure safety. The amendment also references Beechcraft Service Bulletin No 2018, which introduces a kit for easier inspection.
Safety notes
- Inspect for cracks in the engine mount channels to prevent structural failure.
- Repair any defective mount channels and associated structures promptly.
Full document text
COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY SCHEDULE OF AIRWORTHINESS DIRECTIVES Beechcraft 76 (Duchess) Series Aeroplanes AD/BEECH 76/10 Amdt 2 Engine Mount Support Structure 2/91 Applicability: All models. Requirement: Visually inspect the engine mount channels P/Nos. 105-980000 -19, -21, -23, -25 for cracks in the area adjacent to the anchor nut securing the engine mount bolt. Note 1: If mount channel is cracked, visually inspect the associated keel and structure for cracks and structural distress. Note 2: Defective mount channels and associated structure are to be repaired to a scheme acceptable to the Authority. Note 3: Beechcraft SB No 2018 introduces a kit to provide inspection plates to facilitate the engine mount/nacelle channel inspection. Compliance: Within 100 hours time in service after 30 April 1984, or at the next scheduled inspection for Maintenance Release issue after 30 April 1984, whichever occurs first and thereafter at intervals not exceeding 100 hours time in service. Background: This Directive was raised in issue to include a recurring inspection due to reports of engine mount channel failure. Further defects have been reported since the initial one time inspection. This amendment introduces SB No 2018 which supersedes and cancels Beechcraft Service Instruction No 1237.