26___021.PDF

737 600700800900 aircraft maintenance 00 020

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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL 26-21-00-020
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Functional Description When there is an overheat or fire condition, the related engine fire handle switch on the engine and APU fire control panel unlocks. You can also use the manual override under the handle to unlock the fire warning switch. When you pull the switch up, these functions occur: * High pressure fuel valve in HMU closes * Spar fuel valve closes * Thrust reverser control power goes off * Engine driven hydraulic pump shutoff valve closes * Hydraulic system low pressure indication inhibited * Pneumatic pressure regulating and shutoff valve closes * Generator trips off. When you turn the engine 1 fire handle switch clockwise, 28v dc goes to the R bottle dual squib 1. This releases halon which goes from the bottle to engine 1. If you turn the same engine fire handle switch counter-clockwise, 28v dc goes to the L bottle dual squib 1. This releases halon which goes from the bottle to engine 1. When an engine fire extinguisher bottle pressure is less than 250 psi, the bottle pressure switch closes. The related BOTTLE DISCHARGED amber light on the overheat/fire protection panel comes on. The engine 2 fire extinguishing system operates the same as engine 1. The difference is that the engine 2 fire warning switch sends 28v dc to the R or L bottle squib 2. FIRE PROTECTION - ENGINE FIRE EXTINGUISHING - FUNCTIONAL DESCRIPTION EFFECTIVITY AMX ALL 26-21-00 Page 14 Jun 10/2003 D633A101-AMX BOEING PROPRIETARY - Copyright # - Unpublished Work - See title page for details. 737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL 26-21-00-025
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FIRE PROTECTION - ENGINE FIRE EXTINGUISHING - FUNCTIONAL DESCRIPTION FIRE PROTECTION - ENGINE FIRE EXTINGUISHING - FUNCTIONAL DESCRIPTION EFFECTIVITY AMX ALL 26-21-00 Page 15 Jun 10/2003 D633A101-AMX BOEING PROPRIETARY - Copyright # - Unpublished Work - See title page for details. 737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL 26-21-00-025
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Purpose The engine and APU fire extinguisher test does a check for fire extinguisher bottle squib continuity. This test makes sure squib servicing is not necessary. Physical Description The engine and APU fire extinguisher test uses these components: * Three-position toggle switch, spring loaded to the neutral position * L bottle test green light comes on * R bottle test green light comes on * APU bottle test green light comes on. Location The engine and APU fire extinguisher test switch and three green lights are on the engine and APU fire control panel. Operation When you set the EXT TEST switch to the 1 position, a test of these squibs occurs: * L bottle number 1 squib * R bottle number 1 squib * APU bottle squib. When you set the EXT TEST switch to the 2 position, a test of these squibs occurs: * L bottle number 2 squib * R bottle number 2 squib * APU bottle squib. The green test lights come on to show a successful test.
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  • Fall '19
  • Active fire protection, Fire protection, Smoke detector, Fire alarm control panel, Fire alarm system

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