SERVICE BULLETIN NO. 1160A

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Date: November 28, 2022 (S) (M) SERVICE BULLETIN NO. 1160A PIPER CONSIDERS COMPLIANCE MANDATORY Piper Aircraft, Inc. 2926 Piper Drive Vero Beach, FL, U.S.A. 32960 (OVER) ATA/JASC: 5519 Service Bulletin (SB) 1160A supersedes SB 1160 in its entirety. Aircraft that were previously made compliant with SB 1160 are in compliance with SB 1160A. SUBJECT: STABILATOR TORQUE TUBE ASSEMBLY INSPECTION REASON FOR REVISION: SB 1160A clarifies the dimensions and instructions for inspection, replacement, and repair of the stabilator torque tube assembly. MODELS AFFECTED: SERIAL NUMBERS AFFECTED: PA-23-250 Aztec 27-1 through 27-504 PA-23-235 Apache 27-505 through 27-622 PA-23-250 (6 Place) Aztec 27-2000 through 27-4866, 27-7304917 through 27-8154030 PA-E23-250 Aztec 27-2505 through 27-4916, 27-7304917 through 27-7554168 PA-24 Comanche 24-1 through 24-3641, 24-3643 thru 24-3687 PA-24-250 Comanche 24-103 thru 24-3641, 24-3643 through 24-3687 PA-24-260 Comanche 24-3642, 24-4000 through 24-5034 PA-24-400 Comanche 26-2 through 26-148 PA-30 Twin Comanche 30-2 through 30-2000 PA-39 Twin Comanche C/R 39-1 through 39-162 COMPLIANCE TIME: Part I. Inspection Inspect the stabilator torque tube assembly (including bolts, hardware and attached fittings), within the next 100 hours of operation, or at the next scheduled inspection, whichever occurs first. Thereafter, a recurring inspection is required each 10 years, or until superseded by requirements added to the applicable Piper Service Manual. Part II. Replacement / Repair Upon condition, replace or repair corroded parts. APPROVAL: The engineering aspects of this service document have been shown to comply with the applicable Federal Aviation Regulations and are FAA approved. SERVICE BULLETIN NO. 1160A PAGE 2 of 4 PURPOSE: Part I. Inspection Field reports of corrosion have been received of Stabilator Torque Tube assembly. Left uncorrected, this condition could cause distortion or failure of the torque tube, leading to possible loss of control of the aircraft. Part I of this service bulletin provides for inspection of the torque tube assembly and replacement where necessary. Part II. Replacement / Repair To provide corrective action if corrosion is found. INSTRUCTIONS: NOTE: Table 1 lists the aircraft models, serial numbers, torque tube assemblies, and kits applicable to this service bulletin. Part I. Inspection 1. Gain access to the Stabilator Torque Tube Assembly by removing the aft fairing, aft fuselage access panel and stabilator halves, using procedures outlined in the appropriate chapters of the appropriate Service Manual (SM). 2. Check for corrosion and condition. a. Check for corrosion on the inside and outside surface of the torque tube and the condition of the bolts on the inside of the torque tube. b. Check condition of bearings, bearing blocks, and attach fittings inside the fuselage. c. Check condition of balance weight tube attachment fitting and control horn. 3. If corrosion is discovered, proceed to Part II. If no corrosion is discovered, lubricate the torque tube per the appropriate chapter of the SM. 4. Install the stabilator halves, fuselage fairings, and aft fuselage access panel per the appropriate chapters of the SM. 5. Make a logbook entry documenting compliance with Part I of this service bulletin. Part II. Replacement / Repair 1. If surface corrosion or wear is found on parts other than the torque tube, order the appropriate service parts through your Piper Aircraft Inc. authorized dealer or repair parts per Chapter 6 of FAA document AC43.13-1B (Aircraft Inspection and Repair Manual). 2. If corrosion is discovered on the torque tube, repair or replace accordingly. a. Removal of surface corrosion is permitted, provided that the minimum dimensions listed in Table 2 are retained after corrosion is removed. If the minimum dimensions without cadmium plating cannot be retained after removing the corrosion, replace the torque tube by installing the appropriate kit listed in Table 1. CAUTION: REMOVAL OF CADMIUM PLATING REQUIRES ALL APPROPRIATE PPE. b. If the cadmium plating has been removed from part or all of the outside of the torque tube, apply a brush coat of cadmium plate per MIL-STD-865. After applying cadmium plating, verify the torque tube meets the minimum dimensions with cadium plating as listed in Table 2. c. Where paint has been removed from the inside of the torque tube, apply 2 swab coats of acceptable fluid resistant epoxy primer AkzoNobel Aerospace Coatings, Vendor Product Numbers 10P30-5 / TR-115 / EC-275. Treat all other reworked items with Ardrox AV8 (formerly Dinitrol). 3. Install the stabilator halves, fuselage fairings, and aft fuselage access panel per the appropriate chapters in the SM. 4. Make a logbook entry documenting compliance with Part II of this service bulletin. WARNING: IT IS IMPORTANT THAT ANY CORRODED STABILATOR TORQUE TUBE BEING DISCARDED IS DESTROYED TO PREVENT POSSIBLE INADVERTENT FUTURE INSTALLATION ON AN AIRCRAFT. SERVICE BULLETIN NO. 1160A PAGE 3 of 4 Table 1 AFFECTED TORQUE TUBES Model Serial Numbers Affected Original Torque Tube Part Number Replacement Kit Part Number (1) PA-23-235 Apache 27-505 through 27-622 16067-002 652-579 PA-23-250 Aztec 27-1 through 27-504 PA-23-250 (6 Place) Aztec 27-2000 through 27-8154030 PA-E23-250 Aztec 27-2505 through 27-4916, 27-7304917 through 27-7554168 PA-24 Comanche 24-1 through 24-3641, 24-3642 through 24-3687 20203-002 652-580 PA-24-250 Comanche 24-103 thru 24-3641, 24-3643 thru 24-3687 PA-24-260 Comanche 24-3642, 24-4000 through 24-5034 PA-24-400 Comanche 26-2 through 26-148 22655-002 652-581 PA-30 Twin Comanche 30-2 through 30-2000 22655-006 652-582 PA-39 Twin Comanche 39-1 through 39-162 27183-002 652-583 (1) Verify replacement kit come with instructions 88372 rev. H or later. Table 2 TORQUE TUBE DIMENSIONS KIT TUBE WITHOUT CADMIUM PLATING KIT TUBE WITH CADMIUM PLATING Original Torque Tube Part Number