WHEEL WELL FIRE

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Editor : Copyright Ó Smartcockpit.com / Ludovic ANDRE version 01 Smartcockpit.com BOEING 737 BRIEFINGS Page 1 WHEEL WELL FIRE "A wheel well fire warning can not be caused by overheated brakes alone (…)" This a Boeing statement confirmed in a Boeing symposium… Overheated brakes can contribute to a wheel well fire if they become hot enough to ignite the tires, hydraulic fluid or other flammable substances. However, analysis by Boeing indicates that overheated brakes alone can not generate enough heat to trigger the wheel well fire detection system. In most cases extending the gear to cool the brakes and wheel well is effective at coping with the fire condition. Even so there have been a few incidents where extending the gear did not resolve the problem. One such example was an incident where the electrical lead to a hydraulic pump shorted and burned a small hole through the hydraulic pressure line and ignited the spraying fluid. After the gear was extended, the fire warning went out but the fluid from the ruptured line continued to burn. Wheel well fire indications should be treated with the same respect as other fire indications. This includes the requirement to land at the nearest suitable airport. The landing gear should be left extended unless it is absolutely necessary to retract it in order to reach for performance considerations. BOEING 737NG WHEEL WELL FIRE NON NORMAL CHECK-LIST

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WHEEL WELL FIRE