Since an auxiliary power unit (APU) provides electrical power and the pneumatic supply for both air conditioning and main engine start, the impact of a malfunctioning unit at the gate can be severe. Sometimes, an operator’s only indications of impending problems are a loss in bleed pressure and an increase in exhaust gas temperature. This might occur following lengthy operation in hot environments, where high ambient temperatures require additional fuel to be used by the APU. This may ...

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