SERVICE BULLETIN NO. 21
AVIAT HUSKY A-1B · Service Bulletins
Overview
This service bulletin addresses an issue with the flap cable link on the Husky A-1B aircraft, specifically for serial numbers 2397-2418. It outlines the necessary inspections and replacement procedures to ensure safety and compliance.
- Flap cable link may be fabricated from incorrect material.
- Affected serial numbers are 2397-2418.
- Inspect flap cable link for proper thickness immediately.
- Defective links must be replaced before flight.
- Replacement parts are available from Aviat Aircraft Inc.
- A compliance letter must be submitted after inspection.
- No need to remove paint for thickness measurement.
- Follow detailed installation procedures for new links.
Document
Source
Originally published by aviataircraft.com. Sprinkle hosts a reference copy with an added summary, specifications and searchable full text.
Document details
- Type ·
- Service Bulletins
- Year ·
- 2007
- File size ·
- 104 KB
- Publisher ·
- aviataircraft.com
- Language ·
- en
Specifications & performance
Extracted from this document.
Specifications
- Flap cable link thickness (in) ·
- 0.100
What is the SERVICE BULLETIN NO. 21?
The SERVICE BULLETIN NO. 21 is a service bulletins for the AVIAT HUSKY A-1B, dated 2007.
Where does the SERVICE BULLETIN NO. 21 come from?
This copy of the SERVICE BULLETIN NO. 21 was originally published by aviataircraft.com and is hosted on Sprinkle as a free, searchable reference copy.
What year was the SERVICE BULLETIN NO. 21 published?
The SERVICE BULLETIN NO. 21 — the AVIAT HUSKY A-1B service bulletins on file — is dated 2007.
Most owners only have the POH. Here's the essential set for the AVIAT HUSKY A-1B.
- Pilot's Operating Handbook / AFM
- Checklist
- Maintenance Manual
- Parts Catalog (IPC)
- Systems & Wiring
- Service Bulletins on file
- Type Certificate (TCDS)
More AVIAT HUSKY A-1Bmanuals & documents
In this document
Description
The bulletin describes a fabrication issue with the flap cable link, which was made from incorrect sheet stock.
Compliance
Immediate inspection of the flap cable link is required, and defective parts must be replaced before flying.
Installation of a New Flap Cable Link
Instructions for replacing the flap cable link are provided, including required parts and steps.
Procedure
A step-by-step guide for removing the old flap cable link and installing a new one is included.
Compliance Letter
A template for certifying the inspection results and compliance with the service bulletin is provided.
Safety notes
- Inspect flap cable link immediately.
- Replace defective links before flight.
- Ensure proper thickness of the flap cable link.
Full document text
SERVICE BULLETIN NO. 21 Sky International INC. HUSKY A-1B Service Bulletin No. 21 Page 1 of 4 P.O. Box 1240 Afton, WY 83110 USA Tel: 307-885-3151 Fax: 307-885-9674 e-mail: aviat@aviataircraft.com DATE: 12 November 2007 REVISION: IR AIRCRAFT: Husky A-1B SUBJECT: Flap Cable Link MODELS AFFECTED: S/N 2397-2418 ________________________________________________________________________ Engineering Data is FAA Approved DESCRIPTION During a routine inspection of a specific aircraft, it was found that the flap cable link (part number 35064-001) was fabricated from incorrect sheet stock. The link was made from 0.050” 4130N while the link should have been made from 0.100” 4130 N. This discrepancy affects Husky serial numbers 2397-2418. The purpose of this bulletin is to alert owners of this problem so that they may check the flap cable link to ensure that it is of the proper thickness. COMPLIANCE The flap cable link should be inspected immediately. If it is found to be defective, it should be replaced before the airplane is flown again. After the link has been inspected and, if necessary, replaced, the Compliance Letter should be completed and sent to Sky International Inc. and the Federal Aircraft Administration. Be sure to send the letter even if the flap cable link is not defective. INSPECTION Measure the flap cable link and determine if it is the appropriate thickness. See Figure 1. The part should have a base thickness (without paint) of 0.100 inches. Note that it is not necessary to remove the paint - the difference between a 0.100 inch part and a 0.050 inch part is great enough that the thickness of the paint does not affect the accuracy of the measurement. SERVICE BULLETIN NO. 21 Sky International INC. HUSKY A-1B Service Bulletin No. 21 Page 2 of 4 INSTALLATION OF A NEW FLAP CABLE LINK If it is found that the flap cable link is one of the defective parts, a new link should be installed. The parts required to replace the link are available from Aviat Aircraft Inc. by requesting Kit# A-1B-521 and are as follows: PART PART NUMBER QUANTITY Flap Cable Link 35064-001 1 Cotter Key 55675 3 Bolt 50050 3 Washer 58750 3 Castle Nut 54375 3 Service Bulletin SB#21 1 PROCEDURE 1. Undo the 5 cam locks and remove the left side access door and open the battery door. 2. Remove the bell crank access panels on the top of the wings (8 screws each, 1 on each wing). 3. On both sides of the airplane, disconnect the flap cable that attaches to the bell crank. This will release the tension in the cables. 4. Remove the cotter keys, bolts, nuts, and washers that attach the cables to the flap cable link (3 each) and remove the flap cable link. 5. Install a new flap cable link with new bolts, nuts, washers, and cotter keys (3 each). 6. Use 2 people to reconnect the flap cables. Have one person connect the cables to the bell cranks while the other person checks to make sure that the cables stay on the pulleys. 7. Close the battery door, attach the left side access door (5 cam locks), and attach both bell crank access doors on the tops of the wings (8 screws each). SERVICE BULLETIN NO. 21 Sky International INC. HUSKY A-1B Service Bulletin No. 21 Page 3 of 4 Figure 1 Flap System Diagram Flap Cable Link Flap Cables Flap Cable Flap Cable Bell Crank SERVICE BULLETIN NO. 21 Sky International INC. HUSKY A-1B Service Bulletin No. 21 Page 4 of 4 COMPLIANCE LETTER This is to certify that I have inspected the Flap Cable Link in accordance with Service Bulletin No. 21. Results are shown below. Flap Cable Link Thickness Flap Cable Link Replaced ___________inches YES ____ NO ____ Aircraft: Husky A-1B Serial Number: ___________ Registration Number: _____________ Date: ___________ Aircraft Hours: ____________ Signed: _________________________________________ Return completed letter to: Engineering Aviat Aircraft Inc. P.O. Box 1240 Afton, WY 83110 Fax: 307-885-9674 Send a copy to: Federal Aircraft Administration Denver Aircraft Certification Office Attn: Roger Caldwell 26805 East 68th Avenue, Room 214 Denver, CO 80249-6361 Fax: 303-342-1088