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into a canyon after complete loss of control due to a failed flight control attachment for a primary servo. The nut, bolt, and locking mechanism were not found at the crash site. Serviced the night before the crash, it appeared that a self-locking nut was improperly reused and the additional locking split pin was not installed as per the procedures (See Figure 2). Neither the post-maintenance check pilot nor the pilot that flew two revenue flights, prior to the accident flight, noticed the missing locking hardware. The contributing factors to this maintenance accident were the mechanics and inspector's failure to follow maintenance procedures regarding locking mechanisms for critical flight controls. The NTSB concluded that there was a likely fitness for duty issue due to the altered work schedules of the mechanic and the inspector (See Figure 3 for actual work schedule). NTSB attributed blame to the quality of the organization's work cards, which did not contain sufficient detail. Finally, NTSB recommended that all of the maintenance workforce participate in human factors training. Example 3: B-737, Air China 120, August, 2007, Okinawa, Japan While taxiing to the gate after landing, ground staff observed fuel leaking from No. 2 engine pylon. Once stopped away from gate, the leaking fuel ignited. Passengers evacuated via emergency exits. Aircraft burned to total destruction. See Figure 4. The 737-800 has four slats installed on the leading edge of each wing. Each slat rides on two auxiliary tracks. The slat tracks are housed in a track can, which extend into an aluminum housing in the fuel tank. At the fuel tank end of the main track is a downstop bolt that stops the track when it is extended fully forward. For Avionics Services Focused on the Future. Pentastar Aviation Setting the Standard For over half a century — from cockpit to cabin — Pentastar's avionics team has been ensuring aircraft are updated with the most innovative technology. They install, maintain, service and upgrade some of the most complex and technologically advanced equipment on the market. NOW SCHEDULING FOR ADS-B OUT, DU-875 AND 4G WIFI INSTALLATIONS! PentastarAviation.com/avionics 248-666-8388 mtxsales@pentastaraviation.com We specialize in solutions for: Cabin | Cockpit | Connectivity | Engineering | Mandates & NextGen ©2018 Pentastar Aviation. Superior performance from your TPE331 engine As your Honeywell Authorized Service Centre, TAE Aerospace has the complete range of services and support you need to maintain a safe, reliable and efficient TPE331 engine fleet. We are proud to provide aircraft owners and operators across North America with the highest Australian standards of quality and safety in TPE331 engine maintenance, repair and overhaul, combined with local delivery and support. To start a conversation about better performance from your TPE331 engine, contact Mario Chavez – your local TAE Aerospace representative. You can also view our wide range of Honeywell-approved TPE331 services online at www.taeaerospace.com Call +1 706.993.0898 or email mario.chavez@taeaerospace.com TAE Aerospace FIGURE 4. China Air B737 destroyed by fire.