SAIB 2026-07

FAA Aviation Safety

SPECIAL AIRWORTHINESS

INFORMATION BULLETIN SUBJ: MAIN LANDING GEAR ATTACH SECTION, Trunnion Pins SAIB: 2026-07 Date: March 19, 2026 This is information only. Recommendations aren’t mandatory.

Introduction

This Special Airworthiness Information Bulletin advises owners, operators, and maintainers of Learjet Inc. (Learjet) Model 23, 24, 24A, 24B, 24B-A, 24C, 24D, 24D-A, 24E, 24F, 24F-A, 25, 25A, 25B, 25C, 25D, 25F, 28, 29, 31, 31A, 35, 35A (C-21A), 36, 36A, 55, 55B, 55C, and 60 airplanes of the potential for improper installation of the aft trunnion pin in the main landing gear, which could result in collapse of that gear during taxi, takeoff, or landing. This SAIB also provides recommended actions to address this concern.

At this time, the airworthiness concern is not an unsafe condition that would warrant airworthiness directive (AD) action under Title 14 of the Code of Federal Regulations (14 CFR) part 39.

Background

The FAA is issuing this SAIB in response to feedback from industry stakeholders. There have been multiple events reported where the improper installation of the aft trunnion pin in the main landing gear has resulted in gear collapse, including an accident in Scottsdale, Arizona, on February 10, 2025.

To address this airworthiness concern, Learjet released alert service bulletins (ASBs) for the affected models. These ASBs recommend a one-time inspection of the main landing gear aft trunnion pins and additional actions to ensure correct installation. See Table 1 for the applicable ASB by model.

Table 1 Model Alert Service Bulletin Date Learjet 23/24/25 SB A23/24/25-32-20 Mar 7, 2025 Learjet 28/29 SB A28/29-32-21 Mar 7, 2025 Learjet 31 SB A31-32-25 Mar 7, 2025 Learjet 35/36 SB A35/36-32-29 Mar 7, 2025 Learjet 55 SB A55-32-26 Mar 7, 2025 Learjet 60 SB A60-32-42 Mar 7, 2025

Learjet also released temporary revisions to the maintenance manuals of the affected models to add warnings and notes to ensure future maintenance is performed correctly. Some of these temporary revisions have been incorporated into the respective manuals. See Table 2 for the status as of publication of this SAIB.

Table 2 Model Revision / Temporary Revision Date Learjet 23 Temporary Revision No. 25-01 Mar 24, 2025 Learjet 24 Temporary Revision No. 25-01 Mar 24, 2025 Learjet 24B Temporary Revision No. 25-01 Mar 24, 2025 Learjet 24D/E/F Temporary Revision No. 25-01 Mar 24, 2025 Learjet 25 Temporary Revision No. 25-01 Mar 24, 2025 Learjet 25B/C/D/F Temporary Revision No. 32-29 Mar 24, 2025 Learjet 28/29 Maintenance Manual 32-11-00 Aug 12, 2025 Learjet 31/31A Maintenance Manual 32-11-00 Aug 12, 2025 Learjet 35/35A/36/36A Maintenance Manual 32-11-00 Sep 11, 2025 Learjet 55/55B/55C Maintenance Manual 32-11-00 Aug 12, 2025 Learjet 60/60XR Maintenance Manual 32-11-00 Jun 26, 2025

Recommendations

The FAA recommends that all owners, operators, and maintainers of the affected airplanes perform the following actions at the earliest opportunity:

• Review the information in the applicable Learjet ASB identified in Table 1, particularly for airplanes that have recently undergone maintenance of the main landing gear, and accomplish the actions included therein.

• Incorporate the revisions of the applicable maintenance manual or temporary revisions identified in Table 2.

For Further Information Contact

Adam Hein, Aviation Safety Engineer, FAA, 1801 S Airport Road, Wichita, KS 67209; phone: (316) 946-4116; email: ccb-cos@faa.gov.

For Related Service Information Contact

Business Aircraft, Learjet Inc., One Learjet Way, MS 53, Wichita, KS 67277-7707; phone: (866) 538-1247; email: ac.ict@aero.bombardier.com; website: https://my.bombardier.com.