SERVICE BULLETIN SB7034
Piper PA-31T Cheyenne II · Weight And Balance
Overview
This service bulletin, SB7034, addresses the emergency extension air line for the Piper PA-31T Cheyenne II and PA-31T2 Cheyenne II XL models. It provides mandatory instructions for inspecting and potentially rerouting the emergency gear extension air line to prevent chafing against the brake cylinder. The bulletin is applicable to specific serial numbers and outlines the necessary compliance actions to enhance the reliability of the landing gear system. The document is FAA approved and emphasizes the importance of performing the outlined procedures within 25 hours of receipt.
- Mandatory compliance within 25 hours of receipt.
- Applies to specific serial numbers: 31T-8166001 to 31T-8166062.
- Inspect and potentially reroute the emergency gear extension air line to prevent chafing.
- Follow detailed accomplishment instructions for proper installation.
- Materials required include specific part numbers for components.
Document
Source
Originally published by www.parker.com. Sprinkle hosts a reference copy with an added summary, specifications and searchable full text.
Document details
- Type
- Weight And Balance
- Year
- 1995
- Pages
- 2
- File size
- 61 KB
- Publisher
- www.parker.com
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- Pilot's Operating Handbook / AFM
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In this document
Effectivity
The service bulletin applies to Piper PA-31T2 Cheyenne II XL aircraft with serial numbers 31T-8166001 through 31T-8166062, equipped with a specific wheel and brake conversion kit.
Reason for Bulletin
The bulletin was issued to improve reliability by addressing potential chafing of the emergency gear extension air line against the brake cylinder, which could lead to damage.
Compliance
Compliance with the instructions in this bulletin is mandatory and must be completed within 25 hours after receipt.
Accomplishment Instructions
The document outlines step-by-step instructions for inspecting and rerouting the emergency extension air line, including jacking the aircraft, disabling the emergency system, and performing functional tests after installation.
Materials Required
A list of materials required for the modification is provided, including specific part numbers and quantities for components such as nuts, sleeves, grommets, and aluminum tubing.
Full document text
ClevelandWheels & Brakes Parker Hannifin Corporation Aircraft Wheel & Brake 1160 Center Road, P.O. Box 158 Avon, Ohio 44011 USA 1-800-BRAKING (272-5464) 216-937-1272 l FAX 216-937-5409 SERVICE BULLETIN Initial Release March 23, 1994 Rev B December 19, 1995 SB7034 Page 1 of 2 LANDING GEAR - EMERGENCY EXTENSION - INSPECT/REPLACE AIR LINE EFFECTIVITY: Piper, Model PA-31T2, Cheyenne II XL, S/N 31T-8166001 thru 31T-8166062, equipped with Parker Hannifin P/N 199-111, Wheel and Brake Conversion Kit. REASON: Improved Reliability - the combined effects of landing gear rigging, brake lining wear and routing of the emergency gear extension air line can allow the brake cylinder to chafe against the air line when gear is in the up and locked position. Continuous chafing may result in damage to the air line. DESCRIPTION: This document provides the necessary instructions to inspect and reroute the emergency gear extension air line such as to preclude brake cylinder contact. Effective S/N 31T-8166063 and after a parts commonality change at the airframe manufacturer presented a different routing of the air line which coincidentally avoids the brake cylinder area. The routing suggested in this service bulletin is similar to that as shown in the aircraft maintenance manual for S/N 31T-8166063 and subsequent. Parts may be procured locally or as a kit, part number SB7034-1 Service Bulletin Kit - Air Line. The effects of SB7034 have been incorporated into all 199-111 Conversion Kits shipped from Parker April 15, 1994 and after. COMPLIANCE: MANDATORY - to be performed within the next 25 hours after receipt of this Service Bulletin. Note: If you are no longer in possession of this airplane, please forward this information to present owner. APPROVAL: This service bulletin has been reviewed by the Federal Aviation Administration (FAA) and the technical data is FAA approved. WEIGHT & BALANCE: Insignificant. PUBLICATIONS: The contents of this service bulletin have been incorporated into installation drawing 50-82, revision D. Drawing to be included in the 199-111 Conversion Kits shipped from Parker Hannifin April 15, 1994 and after. MATERIALS: Kit list for part number SB7034-1 Service Bulletin Kit - Air Line. Part Number Description Qty. 104-02100 Nut, Tube Coupling, AN818-4D 4 104-02800 Sleeve, Flared Tube, MS20819-4D 4 217-00900 Grommet, MS35489-7 4 300-00123 AL Tubing, 5052-0, .25 ODX .035 Wall (furnish in two, 40 inch lengths) 80" SB7034 Service Bulletin (This Document) 1 SERVICE BULLETIN SB7034 Page 2 of 2 Initial Release March 23, 1994 Rev B December 19, 1995 ACCOMPLISHMENT INSTRUCTIONS: 1. Review log books and inspect main wheel area to determine if a modification to re-route the emergency extension air line (Ref. Fig. 1) has already been accomplished. If not, proceed as follows. 2. Jack aircraft per the aircraft maintenance manual. 3. Disable emergency extension system per the aircraft maintenance manual. 4. Remove existing emergency extension air line (aluminum tubing) between the tee, outboard of the wheel well root rib and the emergency uplock release actuator. 5. Install new air line as shown on Figure 1. 6. Re-enable the emergency extension system per the aircraft maintenance manual. 7. Perform functional tests of both normal and emergency landing gear system, per aircraft maintenance manual. 8. Remove aircraft from jacks and make proper log book entry of accomplishment. Figure 1.