EASA SIB CE-19-21
Air Tractor, Inc., Models AT-602, AT-802, and AT-802A Airplanes - Flap Motor Mounting Studs
Summary
The FAA Special Airworthiness Information Bulletin SAIB: CE-19-21 addresses an airworthiness concern for Air Tractor, Inc. Models AT-602, AT-802, and AT-802A airplanes related to flap motor mounting studs. The bulletin excludes AT-802/AT-802A models equipped with part number 71112-1 flap actuators. It informs owners and operators about inspection and replacement procedures for certain flap motor mounting studs to prevent potential loss of flap control.
What Changed
SAIB CE-19-21 introduces recommendations to inspect the flap motor mounting studs for cracking and to replace any studs found cracked or susceptible to cracking with improved configurations as described in Air Tractor Service Letter #375 dated April 9, 2019. It clarifies that the affected stud configuration is one of three possible types and excludes certain flap actuator part numbers from concern.
Why It Matters
This bulletin is important for aviation professionals because cracked flap motor mounting studs can lead to loss of flap control and interference with aileron controls, posing a safety risk. Operators and maintenance personnel must be aware of the inspection and replacement procedures to maintain safe aircraft operation and prevent potential control failures.
What To Do
Owners and operators of affected Air Tractor models should perform a one-time inspection of the flap actuator motor before further flight following the procedures in Air Tractor Service Letter #375. If cracked or susceptible studs are found, they should be replaced with approved configurations as detailed in the service letter. No mandatory compliance deadline is specified, but prompt action is recommended.