SERVICE BULLETIN NO. 1350

Piper M350 · Service Bulletins

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Overview

This service bulletin, dated December 17, 2020, addresses an important inspection and potential replacement of the nose landing gear steering horn and arm assemblies for specific Piper aircraft models, including the Piper M350. Compliance with this bulletin is considered mandatory by Piper Aircraft, Inc. The bulletin outlines the inspection process for the steering horn assembly and the steering arm assembly, detailing steps to identify any protrusion of steering pads and potential damage. It also provides instructions for replacing the affected components if necessary. The document is intended for maintenance personnel and pilots to ensure the safety and proper functioning of the aircraft's nose landing gear system.

Models affected include PA-46-350P M350, PA-46-500TP M500, and PA-46-600TP M600.
Compliance is mandatory and should be completed during the next scheduled maintenance, not exceeding 50 hours of service.
Inspect the steering horn assembly for protruding steering pads and check for damage to the steering arm assembly.
Replace the steering horn assembly with part number 46N32A009-801 if protrusion or damage is found.
Document compliance with a logbook entry after completing the required actions.

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Document details

Type: Service Bulletins
Year: 2020
Pages: 10
File size: 459 KB
Publisher: s3.amazonaws.com

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In this document

Purpose

The purpose of this service bulletin is to address potential issues with the nose wheel steering horn assembly on affected Piper aircraft. The bulletin highlights that the steering pads may protrude beyond the steering horn rollers, which could lead to improper contact with the steering arm assembly and potential damage if not corrected.

Compliance Time

Compliance with the inspection and any necessary repairs or replacements must coincide with the next regularly scheduled maintenance event, but should not exceed 50 hours of time in service.

Inspection Steps

The bulletin outlines a series of inspection steps to determine if the steering pads are protruding and if there is any damage to the steering arm assembly. This includes visual inspections and measurements using feeler gauges to ensure correct positioning of components.

Replacement Instructions

If the inspections reveal that the steering pads are protruding or if there is damage to the steering arm assembly, the bulletin provides detailed instructions for replacing the steering horn assembly and the steering arm assembly, including part numbers and torque specifications.

Logbook Entry

After completing the required inspections and any necessary repairs or replacements, a logbook entry must be made to document compliance with this service bulletin.

Safety notes

Improper contact between the steering pads and the steering arm assembly can lead to damage.
Repairs to landing gear components are limited to minor reconditioning; significant damage requires replacement.

Full document text

(OVER) Date: December 17, 2020 (S) SERVICE BULLETIN NO. 1350 PIPER CONSIDERS COMPLIANCE MANDATORY ATA/JASC: 3200 Piper Aircraft, Inc. 2926 Piper Drive Vero Beach, FL, U.S.A. 32960 SUBJECT: NOSE LANDING GEAR STEERING HORN AND ARM ASSEMBLIES INSPECTION MODELS AFFECTED: SERIAL NUMBERS AFFECTED: PA-46-350P M350 4636759 through 4636761 PA-46-500TP M500 4697668 through 4697671 PA-46-600TP M600 4698100 through 4698135 COMPLIANCE TIME: To coincide with the next regularly scheduled maintenance event, but not to exceed the next 50 hours time in service. APPROVAL: The engineering aspects of this service document have been shown to comply with the applicable Federal Aviation Regulations and are FAA approved. PURPOSE: The steering pads, which are components welded onto the nose wheel steering horn assembly, may be protruding beyond the steering horn rollers on the affected airplanes. This may result in the steering pads making improper contact with the nose wheel steering arm assembly. Left uncorrected, this condition may cause damage to the steering arm assembly. This service bulletin mandates the following steps to address the issues described: 1. Inspect the steering horn assembly to determine if the steering pads are protruding beyond the steering horn rollers, as described above. 2. Inspect the steering arm assembly for damage due to improper contact with the steering pads. 3. If the steering pads are protruding as described above, then replace the steering horn assembly with a new, improved replacement assembly comprised of the steering horn, pads and rollers. 4. If required, based upon inspection, repair or replace the steering arm assembly. SERVICE BULLETIN NO. 1350 PAGE 2 of 10 46N32A000 C D D A A FS 60.50 ENGINE MOUNT (REF) NOSE GEAR ACTUATOR DOWN SPRING (REF) WHEEL WELL ACTUATOR ROD END NOSE GEAR PISTON TUBE (REF) TRUNNION (REF) BUNGEE ASSEMBLY Figure 1 – Sheet 1 of 5 Nose Wheel Steering Assemblies – Typical INSTRUCTIONS: CAUTION: REPAIR TO LANDING GEAR COMPONENTS IS LIMITED TO THE RECONDITIONING OF PARTS (REPLACING BEARINGS AND BUSHINGS), SMOOTHING OUT MINOR NICKS AND SCRATCHES, AND REPAINTING AREAS WHERE PAINT HAS CHIPPED OR PEELED. FOR GREATER DAMAGE, THE REPLACEMENT OF THE AFFECTED COMPONENTS IS REQUIRED. SERVICE BULLETIN NO. 1350 PAGE 3 of 10 1. Gain access to the location of the Nose Wheel Steering Horn Assembly, Piper part number (P/N) 85154-012, and Nose Wheel Steering Arm Assembly, Piper P/N 83626-004. These assemblies are installed above the gear trunnion assembly, just inside the nose landing gear wheel well. Refer to Figure 1. 2. Remove the steering horn from the aircraft. See View A–A and Detail B. NOTE: Prior to removal, verify if Steering Horn and Roller Assembly, P/N 46N32A009-001, is installed. If so, then there is no need to replace the part. Proceed to Step 5. a. Remove and discard the safety wire retaining the three bolts that attach the steering horn base to the trunnion. b. Loosen and remove the three Bolts AN4H5A and Washers NAS1149F0463P. Retain the hardware for reinstallation; replace any hardware, depending on condition. c. Remove the Nose Wheel Steering Horn Assembly, P/N 85154-012. Do not remove the two Rollers, P/N 83638-002 and P/N 83638-006, from the assembly. 3. Visually inspect the steering horn pads and rollers for any signs of damage. • If there is any damage, other than minor nicks or other minor wear, then the steering horn assembly must be replaced, which will be accomplished in an upcoming step. Proceed to Step 5. • If there is no visually apparent damage, then proceed to Step 4. 4. Check if the steering pads and rollers are positioned correctly on the steering horn as shown in Detail C. Place the steering horn onto a flat surface, with the rollers facing the surface. Use a feeler gauge, or a shop aid of appropriate thickness, to determine if the parts are positioned as depicted in Detail C. NOTE: Detail C provides the correct positioning of the rollers and pads on both the existing and replacement steering horn. • If the steering pads and rollers are not positioned as Detail C shows, then the parts must be replaced, which will be accomplished in an upcoming step. Proceed to Step 5. • If the steering pads and rollers are positioned as Detail C shows, then it may not be necessary to replace the steering horn assembly and rollers. Proceed to Step 5. 5. Inspect the Arm Assembly, P/N 83626-004, for any signs of damage, especially in the areas where the steering pads make contact. NOTE: This inspection further verifies whether or not the steering pads and rollers, as well as the steering arm, are positioned and installed properly. Existence of the described damage to the arm assembly would indicate that the steering horn pads are improperly contacting the arm, which means the steering horn assembly, and potentially the steering arm assembly, must be replaced. • If there is any damage at all to the steering arm assembly, then proceed to Step 6. • If there is no damage to the steering arm assembly, then proceed to Step 7. 6. Assess the level of damage to the Arm Assembly, P/N 83626-004, discovered during the inspection in Step 5. • Repair of the arm assembly is limited to minor damage, such as minor nicks or scratches, chipped or peeled paint, or replacement of the bearing. If minor repairs are possible, then once they are completed, proceed to Step 7, to reinstall or replace the steering horn assembly. • More significant damage to the arm assembly requires the replacement of the arm assembly. Proceed to Step 7, to replace the steering horn assembly (Step 7.a.) and the arm assembly (Step 7.c.). SERVICE BULLETIN NO. 1350 PAGE 4 of 10 DETAIL B STEERING HORN BASE (TYPICAL) (VIEW ROTATED 90 DEGREES CW) BOLT AN4H5A WASHER NAS1149F0463P (3 PLACES) (SEE NOTE) SAFETY WIRE MS20995-C32 TRUNNION ASSEMBLY STEERING HORN ASSEMBLY STEERING HORN BASE NOTE: Torque Bolts AN4H5A to 25–30 in-lb. 3D VIEW STEERING HORN ASSEMBLY P/N 85154-012

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FWD UP VIEW A–A STEERING HORN ASSEMBLY WITH ROLLERS LOOKING DOWN STEERING HORN ASSEMBLY P/N 85154-012 (SEE 3D VIEW) STEERING PAD STEERING HORN BASE (SEE 3D VIEW) ROLLER P/N 83638-002 DETAIL B DETAIL C ROLLER P/N 83638-006 FWD FWD STEERING PAD Figure 1 – Sheet 2 of 5 Nose Wheel Steering Assemblies – Typical SERVICE BULLETIN NO. 1350 PAGE 5 of 10 DETAIL C CORRECT ROLLER AND PAD POSITIONING (TYPICAL OF BOTH ENDS OF HORN AND ALL HORN ASSEMBLIES) ROLLER SURFACE PAD PLATE SURFACE SEE NOTE NOTE: The surface of both rollers must be positioned between plus 0.020 in. maximum and minus 0.001 in. maximum distance from the surface of both steering pad plates. The acceptable distance is applicable to both sides at the same time. PLUS MINUS FWD Figure 1 – Sheet 3 of 5 Nose Wheel Steering Assemblies – Typical SERVICE BULLETIN NO. 1350 PAGE 6 of 10 7. Replacement and Reinstallation of Parts Complete any of the following steps that apply, based on the results of the inspections completed in previous steps: a. Replace the steering horn assembly and rollers with the new, improved assembly. NOTE: If the existing steering horn assembly and rollers are going to be reinstalled, then skip to Step b. 1) Order one (1) Nose Wheel Steering Horn and Roller Assembly, P/N 46N32A009-801, which is shown in Figure 2. This new, improved assembly replaces, as one assembly, the existing steering horn assembly (which includes the steering pads) and steering horn rollers. 2) Install P/N 46N32A009-801 onto the trunnion assembly, as shown in in Detail B. Torque the bolts per the note in Detail B. Safety wire the bolts with P/N 151-296 (MS20995-C32). b. Reinstall the existing steering horn assembly and rollers (if applicable). 1) Place the steering horn base (with rollers installed) back onto the top of the trunnion assembly, as shown in Detail B. 2) Install the hardware retained in Step 2, and torque the bolts per the note in Detail B. Safety wire the bolts with P/N 151-296 (MS20995-C32). c. Replace the steering arm assembly, if required. 1) Order one (1) of each: • Steering Arm Assembly, Piper P/N 83626-004 • Cotter Pin, P/N 424-052 (MS24665-134) (for the bungee attachment, all models) • Cotter Pin, P/N 424-059 (MS24665-283) (for the M600 only) 2) Remove the existing arm assembly: a) Disconnect the forward end of the steering bungee from the left hand side of the steering arm, shown in View D–D. Retain the hardware for reinstallation (see View G–G), except for the cotter pin, which is to be discarded; replace any hardware, depending on condition. b) From the bolt assembly common to the steering arm and the mount plate, shown in View F–F, remove the cotter pin, nut and washer that fasten the steering arm to the mount plate. Discard the cotter pin and retain the other hardware; replace any hardware, depending on condition. c) Lift the steering arm assembly off of the bolt. 3) Install the new, replacement Steering Arm Assembly, P/N 83626-004: a) Position the replacement steering arm assembly on the bolt (AN6-15 for M600, or AN6-14A for M350 and M500). Ensure that the bolt hardware stack-up is exactly as defined, for the appropriate model, in View F–F. Replace any hardware on condition. b) Torque the nut (MS17825-6 for M600, or MS21042-6 for M350 and M500), per the note in View F–F. c) On the M600 only, install a new Cotter Pin, P/N 424-059 (MS24665-283). SERVICE BULLETIN NO. 1350 PAGE 7 of 10 Figure 1 – Sheet 4 of 5 Nose Wheel Steering Assemblies – Typical VIEW D−D FACTORY INSTALLED STEERING HORN ASSEMBLY (P/N 85154-012) AND STEERING ARM ASSEMBLY (P/N 83626-004) LOOKING DOWN F F STEERING ARM ASSEMBLY P/N 83626-004 STEERING HORN ASSEMBLY P/N 85154-012 STEERING ARM BOLT ASSEMBLY STEERING HORN MOUNT PLATE P/N 84034-003 LOCKING ASSEMBLY ROLLER P/N 83638-006 ROLLER P/N 83638-002 STEERING PAD STEERING PAD FWD DETAIL E BUNGEE ASSEMBLY G G NOTE: The clearance between the steering arm and both of the rollers must be 0.010 – 0.030 inch. DETAIL E CLEARANCE BETWEEN STEERING ARM AND ROLLERS SERVICE BULLETIN NO. 1350 PAGE 8 of 10 VIEW F−F STEERING ARM BEARING BOLT STACK-UP AND JAM NUTS BOLT STACKUP – SEE NOTE A NUT TORQUE – SEE NOTE B LOCKING ASSEMBLY P/N 83308-002 (REF) WASHER P/N 62833-010 JAM NUT P/N AN315-3R STEERING ARM ASSEMBLY (REF) SPACER P/N 82695-005 STEERING HORN MOUNT PLATE P/N 84034-003 NOTE B: For M600 only, torque the Nut MS17825-6 to 100 in-lb, then back off to the nearest radial slit. For M350 and M500, torque the Nut MS21042-6 to 175-190 in-lb. For M600 (shown): BOLT AN6-15 WASHER NAS1149F0663P NUT MS17825-6 COTTER PIN MS24665-283 NOTE A: The bolt stackup, by models: For M350 and M500: BOLT AN6-14A NUT MS21042-6 VIEW G−G BOLT COMMON TO THE BUNGEE AND STEERING ARM ASSEMBLIES BUNGEE ASSEMBLY BOLT AN4-11 WASHER NAS1149F0432P (UNDER BOLT HEAD) WASHER NAS1149F0463P (2 REQ., UNDER NUT) NUT MS17825-4 (SEE NOTE) COTTER PIN MS24665-134 WASHER NAS1149F0432P NOTE: Torque the Nut MS17825-4 to 35 in-lb, then back off to the nearest radial slit. STEERING ARM ASSEMBLY (REF) Figure 1 – Sheet 5 of 5 Nose Wheel Steering Assemblies – Typical SERVICE BULLETIN NO. 1350 PAGE 9 of 10 8. Alignment and Adjustment of Nose Landing Gear To ensure that the nose gear components have been properly installed, review the entirety of Piper Service Letter 1286 (latest revision), “Nose Landing Gear Steering Components Inspection and Adjustment,” and complete the applicable procedures to ensure proper nose gear alignment, adjustment and rudder cable tension. 9. Complete a logbook entry documenting compliance with this service bulletin, after the applicable steps in SL 1286 (latest revision) have been accomplished. Figure 2 Replacement Steering Horn and Roller Assembly LARGE ROLLER STEERING HORN AND ROLLER ASSEMBLY P/N 46N32A009-801 LOOKING DOWN STEERING PAD HORN ASSY DETAIL C(Fig. 1) FWD SMALL ROLLER STEERING PAD NOTE: The two rollers are attached to the horn assy as part of replacement assembly P/N 46N32A009-801. SERVICE BULLETIN NO. 1350 PAGE 10 of 10 MATERIAL REQUIRED: Per aircraft, on condition: • One (1) each, Horn and Roller Assy – Nose Wheel Steering, Piper P/N 46N32A009-801; as required, Safety Wire, P/N 151-296 (MS20995-C32) • One (1) each, Arm Assembly – Steering, Piper P/N 83626-004; Cotter Pin, P/N 424-052 (MS24665-134) • For PA-46-600TP M600 only – one (1) each, Cotter Pin, P/N 424-059 (MS24665-283) AVAILABILITY OF PARTS: Your Piper Approved Service Center EFFECTIVITY DATE: This service bulletin is effective upon receipt. SUMMARY: Applicable factory participation is limited to new aircraft in warranty at the time of compliance. Factory participation will remain in effect for a period of time not to exceed 180 days from the date of this service bulletin. Please contact your Piper Approved Service Center to make arrangements for compliance with this service bulletin in accordance with the compliance time indicated. NOTE: Please notify the factory of any address/ownership corrections. Changes should include aircraft model, serial number, and current owner’s name and address. Corrections and/or changes should be directed to: PIPER AIRCRAFT, INC. Attn: Customer Service 2926 Piper Drive Vero Beach, FL 32960 or: CustomerService@piper.com Please include in subject line: “Aircraft ownership update”

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