Maintenance Airframe; Maintenance Powerplant
Communication Breakdown; Confusion; Fatigue; Workload
Aircraft Equipment Problem Less Severe
General Maintenance Action
Chart Or Publication; Human Factors; Incorrect / Not Installed / Unavailable Part; Aircraft; Manuals
Maintenance personnel say they found the Left-Hand (LH) Main Landing Gear (MLG) Auxiliary (Aux) Retract actuator to be missing a bushing on the 'wing side' bolt attachment point on Aircraft X; a CRJ-900 aircraft in the ZZZ hangar.  The aircraft was in the hangar due to a leaking MLG Retract actuator. The bushing was replaced with no damage noted. ZZZ Maintenance reported a missing slip bushing. February 2014; during Routine Overnight Maintenance (RON); I; as the Inspector; along with a Mechanic X; installed the LH MLG Aux Actuator on Aircraft X.  We performed Task Card RXXX6; Step-9.  We installed the LH MLG Aux Actuator as required by CRJ-900 Aircraft Maintenance Manual (AMM) Task 32-32-03-XXX.  The maintenance procedure calls out to install the slip bushing and pin in the Aux Actuator in Step 4 A. (1); (d).  There is a 'Note' under the Step that states: 'Make sure the slip bushing (17) is under the head of the pin.'  Further; if you reference Figure (Fig) 405; Sheets One and Two both show the bushing UNDER THE HEAD OF THE PIN for the LH AUX Actuator AS SHOWN.  The right side is opposite.  When I looked at the hardware stack it looked correct.  The AMM Manual was wrong; the bushing is in fact installed under the washer on the nut side.  You have to bend over and carefully look for the bushing when in place or you will miss it.  I understand that only a bushing was required to correct the problem. After researching this procedure; I noticed that the AMM I had to work with was updated two days after I performed this task.  The CRJ-900 AMM Temporary Revision (TR) 32-XXXX Revision issued two days later has corrected the misprint to state in the Note: 'Make sure the Slip bushing (17) is under the washer (21) on the LH MLG and under the head of the pin (20) on the RH MLG.'  Furthermore; they corrected the figures (images) and even added an additional Figure for clarification. Fatigue. Graveyard shift.
An Aircraft Maintenance Inspector was informed that a slip bushing for the Left-Hand (LH) Main Landing Gear (MLG) Auxiliary (Aux) Retract actuator was found missing on a CRJ-900 aircraft; approximately three weeks after he inspected the actuator installation. The Aircraft Maintenance Manual (AMM) Figures (drawings) were incorrect.