Jet/Long Ranger/206
Maintenance Airframe; Maintenance Powerplant
Maintenance Technician 6
Communication Breakdown; Confusion; Situational Awareness
Aircraft Equipment Problem Less Severe; Deviation / Discrepancy - Procedural Published Material / Policy
General Maintenance Action
Chart Or Publication; Human Factors; Incorrect / Not Installed / Unavailable Part; Equipment / Tooling
October 2013; I incorrectly installed a narcotic (narc) lock box into the hatrack area of the medical helicopter. The previous narc box was incorrectly located and had become unserviceable; so a new one was ordered. When the new one arrived; it came with the narc box that was pre-drilled with two holes; and two 'pop-rivets' to attach it with. I incorrectly assumed that the rivets were to be put into the box to secure it to the hatrack. After installation; I signed-off the discrepancy per my company's drawing; once again incorrectly thinking that this was the drawing that used the rivets. I failed to look at the Revision number or the most current drawing. According to the new drawing; I was supposed to drill four new holes for bolts and put the bolts through the narc box; hatrack; and a doubler on the underside of the hatrack (which was not present). This error was discovered when one of the rivets pulled through the hatrack and the narc box became loose. Upon this discovery; the rest of the parts of the installation kit were ordered and the narc box was installed according to the most current drawings. I believe that this could have been avoided by two factors. The first and foremost would be to inspect the drawings and not make assumptions. The second is to send [current information with] the Installation Kit to properly install the narc box instead of outdated methods that are not used anymore; therefore reducing the assumptions made by the mechanics.
An Aircraft Maintenance Technician (AMT) describes how he incorrectly assumed that a new narcotic lockbox that arrived with two pre-drilled holes; two pop-rivets and a company drawing was the procedure to install the lock box in a Bell 206L helicopter.