Glider Owners: FAA Demands Crack Checks and Carbon Fixes
Published Date: 4/3/2026
Rule
Summary
If you own or maintain a DG-1000M glider, listen up! The FAA found cracks near the engine mount and is requiring inspections, maintenance updates, and new parts like a carbon fiber bracket to keep your glider safe. These changes kick in April 20, 2026, so get ready to inspect, adjust, and balance before then—safety first, and no surprise costs if you stay on top of it!
Analyzed Economic Effects
8 provisions identified: 7 benefits, 1 costs, 0 mixed.
Immediate engine‑mount crack inspections
If you operate a DG-1000M glider, you must inspect the steel frame engine mount (part number 10M112) for cracks before the next engine operation after April 20, 2026. If cracks are found, you must repair or replace the mount before further flight, or follow approved repair instructions from the FAA, EASA, or DG Aviation's DOA.
Install CFRP bracket and balance propeller
You must install a carbon fiber-reinforced plastic (CFRP) bracket (P/N 10M227) between the two upper drive belt guide roller brackets and perform dynamic balancing of the propeller assembly within 15 hours time-in-service or 11 months (whichever occurs first) after April 20, 2026. The FAA estimates 2 work-hours ($170) for bracket installation and 2 work-hours ($170) for dynamic balancing.
FAA cost estimates and affected fleet size
The FAA estimates this AD affects two U.S.-registered DG-1000M gliders. The FAA's estimated labor costs per action are: update maintenance manual 1 work-hour ($85); inspect engine mount 1 work-hour ($85); powerplant belt tension inspection 1 work-hour ($85); install CFRP bracket 2 work-hours ($170); dynamic propeller balancing 2 work-hours ($170). On‑condition labor estimates include repair engine mount 4 work-hours ($340); adjust belt tension 2 work-hours ($170); replace engine mount 4 work-hours ($340).
Mandatory belt tension check and adjustment
Before the next engine operation after April 20, 2026, you must perform a powerplant belt tension inspection on DG-1000M gliders and adjust belt tension if necessary in line with DG Aviation Technical Note TM1000-51 Issue 01.d. The FAA estimates 1 work-hour for the inspection (labor cost $85).
Maintenance manual page revision required
Before the next engine operation after April 20, 2026, you must revise page 0.13 of the DG-1000M maintenance manual in accordance with DG Aviation Technical Note TM1000-51 Issue 01.d. The FAA estimates this action takes 1 work-hour (labor cost $85).
Old maintenance task banned
Starting April 20, 2026, you may not perform any maintenance on a DG-1000M sailplane using the old maintenance manual task 4.10.2 (Mounting and tensioning of the drive belts) that was issued before January 2025.
Engine‑mount installation prohibition unless serviceable
As of April 20, 2026, you may not install a steel frame engine mount identified as affected (P/N 10M112) on any glider unless it is a serviceable part (new or passed the specified engine mount inspection prior to installation).
Special flight permit limited to maintenance ferry
A one-time special flight permit may be issued to fly a DG-1000M to a maintenance base to perform the required AD actions, but that permit must specify that the engine not be operated during the flight (14 CFR 21.197 and 21.199).
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