December 25, 20187 yr Hello, When I did the IND LTS test I noticed that the asterisk like fire warning lights on the fuel control switches did not light up. They only did so with the overhead fire test. -Angelo Busato FSX:SE 747-400 Edited December 25, 20187 yr by killairbus Angelo Busato
December 25, 20187 yr Commercial Member 14 minutes ago, killairbus said: Hello, When I did the IND LTS test I noticed that the asterisk like fire warning lights on the fuel control switches did not light up. They only did so with the overhead fire test. -Angelo Busato FSX:SE 747-400 Correct behavior these will light only with the fire test Chris Makris PLEASE NOTE PMDG HAS DEPARTED AVSIM You can find us at http://forum.pmdg.com
December 26, 20187 yr Author 14 hours ago, Olympic260 said: Correct behavior these will light only with the fire test Interesting, why is that? -Angelo Busato Angelo Busato
December 26, 20187 yr Commercial Member 6 hours ago, killairbus said: Interesting, why is that? -Angelo Busato You can ask Boeing for this 🙂 As far as I know this is the case on all Boeing planes. Chris Makris PLEASE NOTE PMDG HAS DEPARTED AVSIM You can find us at http://forum.pmdg.com
December 26, 20187 yr 16 hours ago, killairbus said: Interesting, why is that? -Angelo Busato Not sure why, but more common than you think. The CRJ works in the same manner. Thanks, Randall Coultas Spoiler Flight Sim: P3Dv4,4/ PC: i6700K @ 4.0Ghz / Asus Maximus VIII Hero / NZXT Kraken X61 / 16Gb ram / 2 X Samsung 840 EVO SSD 500Gb / WD Black 1TB / Geforce GTX 980ti
December 26, 20187 yr 19 hours ago, killairbus said: Interesting, why is that? -Angelo Busato I believe it is because these lights are an integral part of the Engine Fire/Overheat detection system and not merely simple Indication lights. As such, their sole purpose is to illuminate only when there is a fire in the associated engine, or during the fire/overheat test. Pushing the FIRE/OVHT TEST ENG switch actually introduces a fire/overheat signal into the Engine Turbine overheat detectors. Bertie Goddard
December 30, 20187 yr On 12/27/2018 at 9:21 AM, berts said: Pushing the FIRE/OVHT TEST ENG switch actually introduces a fire/overheat signal into the Engine Turbine overheat detectors. Technically speaking, the test induces an artificial fire signal in the AFOLTS* cards, not the overheat detectors themselves. *Automatic Fire/Overheat Logic Test System The turbine overheat detectors are only found on the RB211. These are overheat "switches", which talk directly to the AFOLTS (computer) cards. The normal (cowl) fire detectors (or "loops" as they are known) are found on all engine types. The loops feed into specialised detector cards. These determine if the signals from the loops are faults or fires. The detector cards then talk to the AFOLTS cards. The AFOLTS cards process test pushbutton and fire/fault signals and then send signals to the rest of the aircraft to produce lights, bells and messages. There are very few indicator lights on the flight deck which are not illuminated by the Master Dim and Test System. The engine/APU fire and squib tests lights are some of these (including the fire handles). Other lights that come to mind are the big orange EVAC light on the pedestal and the Stab Greenband forward/aft lights. On some Boeing aircraft, some light tests may be affected by the configuration of aircraft switches. John H Watson (retired 744/767 Avionics engineer)
December 31, 20187 yr On 12/30/2018 at 1:54 AM, Qavion2 said: Technically speaking, the test induces an artificial fire signal in the AFOLTS* cards, not the overheat detectors themselves. *Automatic Fire/Overheat Logic Test System The turbine overheat detectors are only found on the RB211. These are overheat "switches", which talk directly to the AFOLTS (computer) cards. I agree and should have obviously explained this in more detail! Bertie Goddard
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