B767-300 and 300 ER
Maintenance Airframe; Maintenance Powerplant
Training / Qualification
Aircraft Equipment Problem Critical; Deviation / Discrepancy - Procedural Published Material / Policy; Deviation / Discrepancy - Procedural Maintenance
Aircraft Aircraft Damaged; General Maintenance Action
Incorrect / Not Installed / Unavailable Part; Procedure; Human Factors; Aircraft
An Aircraft (AC) arrived on an air interrupt; for the landing gear not coming up. The airplane landed with three green lights on the gear; and taxied to the gate on its own power; no tractor or tug needed. Upon arrival to the gate; inspection of the gear; revealed; that the number 2 brake rod was off the brake; and ground down; and the brake rod retaining bolt; Tang washer and pin were missing from the aircraft. There was also damage to various brake hydraulic lines and electrical harnesses and connectors.While speaking to various mechanics; Crew Chiefs; and tech Crew Chiefs; it's been found; that there is a possibility of putting the brake pin; tang washer and brake rod retaining bolt on; with the locking screws engaged; and the tang washer and retaining bolt not being fully engaged. It's possible; if the pin and retaining bolt; are not cleaned properly; that the tang washer may not seat in the 2 grooves; and could be drawn out; to be able to insert the locking screws; safety them; and the tang washer would continue to free float.I believe; that this installation; may not be an isolated case; and we may possibly have a systemic issue; on this type brake and pin scenario. This is the affected fleet with this type installation; with [manual as] reference. Remove the Brake Rods from the Main Landing Gear.I believe; that this should drive; at least a 10% verification on our fleet; to make sure that these pins have been properly installed; to prevent risk of damage; and or injury.
The reporter stated; the rod in question is an anti-rotation rod from the Main Landing Gear (MLG) truck to the brake assembly. When the brake rod disconnected from the brake it dropped to the ground and was severely damaged and prevented the MLG from retracting. The reporter stated the reason for the rod disconnecting is after inserting the pin; that connects the rod to the brake; securing the pin is a complicated process which when not done properly can lead to failure. The reporter went on to say that since this occurrence; engineering put out an order to inspect all other B767-300s to ensure that the brake rods were secured properly.
A B767-300 Number 2 Brake Rod was found unattached from the brake. The Landing Gear was unable to retract due to the rod being unattached.