SERVICE BULLETIN
Piper PA-30 Twin Comanche · Service Bulletins
Overview
This Service Bulletin from Piper Aircraft Corporation addresses issues related to the stabilator torque tube bearing block attachment fitting rivet replacement for several aircraft models, including the Piper PA-30 Twin Comanche. It provides critical information regarding inspection procedures for stabilator movement and noise, which may indicate a need for further action. The bulletin is effective as of April 20, 1974, and outlines compliance requirements for affected aircraft during the next 100-hour or annual inspection. The document serves as a guide for maintenance personnel and aircraft owners to ensure the safety and reliability of the stabilator assembly.
- Models affected include PA-30 Twin Comanche and others.
- Compliance is required at the next 100-hour or annual inspection.
- Inspect stabilator for movement and noise as per instructions.
- Contact Piper Aircraft if movement or noise is detected.
- No materials are required for the inspection.
Document
Source
Originally published by www.piperflyer.com. Sprinkle hosts a reference copy with an added summary, specifications and searchable full text.
Document details
- Type
- Service Bulletins
- Year
- 1974
- Pages
- 3
- File size
- 136 KB
- Publisher
- www.piperflyer.com
Common. Rarer than 5% of the aircraft models we track.
Most owners only have the POH. Here's the essential set for the Piper PA-30 Twin Comanche.
- Pilot's Operating Handbook / AFM
- Checklist
- Maintenance Manual
- Parts Catalog (IPC)
- Systems & Wiring
- Service Bulletins
- Type Certificate (TCDS)
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In this document
Models Affected
The bulletin applies to several models including the PA-24-180, PA-24-250, PA-24-260, PA-24-400, PA-30 Twin Comanche, and PA-39 Twin Comanche. Specific serial numbers affected are listed, ensuring that owners and maintenance personnel can identify whether their aircraft is included.
Compliance Time
Owners are required to comply with the inspection at the next 100-hour inspection or annual inspection, whichever occurs first, but not to exceed the next 100 hours of operation.
Inspection Instructions
The bulletin details a step-by-step inspection process for the stabilator. This includes exerting fore and aft, and up and down forces on the stabilator tip while another person checks for movement or noise in the stabilator torque tube bearing fittings.
Action Required
If movement or noise is detected during the inspection, immediate contact with Piper Aircraft's Customer Services Department is required. If no issues are found, only a logbook entry is necessary.
Material Required
No specific materials are required for this inspection, and parts availability is not applicable.
Safety notes
- Movement or noise in the stabilator area may indicate a serious issue that requires immediate attention.
Full document text
SERVICE BULLETIN Piper Aircraft Corporation Lock Haven, Pennsylvania, U.S.A. April 10, 1974 S/M (This supersedes and voids Service Bulletin No. 411, dated March 1, 1974) Subject: Stabilator Torque Tube Bearing Block Attachment Fitting Rivet Replacement Reason for Revision: Models Affected: PA-24-180, PA-24-250 and PA-24-260 Comanche PA-24-400 Comanche PA-30 Twin Comanche PA-39 Twin Comanche C/R compliance Time: Purpose: Extension of coverage to include PA-39 Twin Comanche C/R aircraft (see Models Affected and Serial Numbers Affected, below). Serial Numbers Affected: 24-1 to 24-5047 incl. 26-2 to 26-148 incl. 30-1 to 30-2000 incl. 39-1 to 39-155 incl. At the next 100-hour inspection or annual inspection, which- ever occurs first, not to exceed the next 100 hours of operation. Information has been received by the factory describing movement and/or noise in the area where the stabilator assembly joins the fuselage. It has been determined that the above described condition may have been caused by one of the following (refer to attached sketch for a pictorial description of the affected areas): 1. Stabilator torque tube bearings not firmly seated in the stabilator torque tube bearing blocks. 2. The holes in the stabilator torque tube bearing upper and lower fittings may be enlarged. This service release provides information to inspect the above referenced aircraft for stabilator movement and/or noise. nstructions: 1. Grasp the stabilator tip and exert a fore and aft force and then an up and down force. (over) Service Bulletin No. 411A Page 2 of 3 Instructions: (continued) 2. Simultaneously (with Step 1, above), have another person check closely for movement and/or noise in the area described in Purpose, above (the attached sketch illustrates a recommended method of detecting movement in the stabilator torque tube bearing fittings area). 3. If there are no indications of movement and/or noise, no further action is required (other than log book entry). 4. If there is movement and/or noise in the area described in Purpose, above, immediately contact the Customer Services Department, Piper Aircraft Corporation, Lock Haven, Pennsylvania 17745. Material Required: Availability of Parts: Effectivity Date: Not applicable. Not applicable. This Service Bulletin is effective April 20, 1974. Summary: Please contact your Piper Field Service Facility to make arrangements for compliance with this Service Bulletin in accordance with the provisions of Compliance Time, above. A Service Publication Compliance Form is enclosed with each copy of this service release being mailed to affected owners of record; this form is to be filled out according to the instructions on the form reverse side and left with the Piper Field Service Facility performing the modification. Tail Page 3 of 3 Stabilator Torque Tube Bearing Blocks Stabilator Torque Tube Bearing Fittings Rivets (Five Fitting) Fuselage Stabilator Torque Tube Bearing Fitting (Four per Airplane) Service Bulletin411A