112th_Rossi Posted April 16, 2012 Share Posted April 16, 2012 Hi guys I was flying a mission last night, which involved some high altitude flight. As I was climbing through 10,000ft I forgot to enable my pitot heat switch. As a result, when I was returning to base and reducing speed, my IAS indicator was all over the place causing a speed caution warning. It recovered eventually (I guess as I was at a lower altitude or something). I am right in thinking this is what happens if you neglect the pitot heat arent I? Also, is there a way of switching to an alternate speed indication system if this happens? Thanks. Link to comment Share on other sites More sharing options...
Eddie Posted April 16, 2012 Share Posted April 16, 2012 I am right in thinking this is what happens if you neglect the pitot heat arent I? Yes. Also, is there a way of switching to an alternate speed indication system if this happens? No. Just switch on the Pitot Heat and the fault will clear in a minute or so. Spoiler Intel 13900K (5Ghz), 64Gb 6400Mhz, MSi RTX 3090, Schiit Modi/Magi DAC/AMP, ASUS PG43UQ, Hotas Warthog, RealSimulator FSSB3, 2x TM MFDs + DCS MFDs, MFG Crosswinds, Elgato Steamdeck XL Link to comment Share on other sites More sharing options...
112th_Rossi Posted April 16, 2012 Author Share Posted April 16, 2012 Cool. Thanks :) Link to comment Share on other sites More sharing options...
badger66 Posted April 17, 2012 Share Posted April 17, 2012 Dont forget to heat your peter heater ..... it can do funny stuff otherwise . Link to comment Share on other sites More sharing options...
Harzach Posted April 17, 2012 Share Posted April 17, 2012 Someone forgot to pack their checklists! Link to comment Share on other sites More sharing options...
amalahama Posted April 17, 2012 Share Posted April 17, 2012 Also, is there a way of switching to an alternate speed indication system if this happens? Thanks. Well, you always can check your TAS in CDU screen Regards! Link to comment Share on other sites More sharing options...
viethson Posted April 19, 2012 Share Posted April 19, 2012 Well, you always can check your TAS in CDU screen Regards! And what do you think where this information is taken from? ;-) You could take the groundspeed as this is only calculated by INS and/or GPS Link to comment Share on other sites More sharing options...
bluepilot76 Posted April 19, 2012 Share Posted April 19, 2012 If you don't heat it, and fly through moisture below zero, it can freeze over the tube. Then your ASI will will be inaccurate. So turn it on, pretty sure you would do this before takeoff. AF447 started to go wrong when the pitot froze over. Technical Specs: Asus G73JW gaming laptop... i7-740QM 1.73GHz ... GTX460m 1.5GB ... 8GB DDR5 RAM ... Win7 64 ... TIR5 ... Thrustmaster T16000m Link to comment Share on other sites More sharing options...
bluepilot76 Posted April 19, 2012 Share Posted April 19, 2012 Ground speed from GPS etc might be slightly useful, but you need to be cautious: if the winds are 100 knots at your altitude (not unusual), this could easily be the difference between stalling or exceeding red line speed. Technical Specs: Asus G73JW gaming laptop... i7-740QM 1.73GHz ... GTX460m 1.5GB ... 8GB DDR5 RAM ... Win7 64 ... TIR5 ... Thrustmaster T16000m Link to comment Share on other sites More sharing options...
viethson Posted April 21, 2012 Share Posted April 21, 2012 (edited) In level flight you should have no problem with overspeed even at full throttle, this is not Concorde :-) During approach speed is vital. Here groundspeed can be useful. As there normally should be headwind on final flying your normal app speed as groundspeed is on the safe side. Also use your AOA gauge. You can perfectly fly the aircraft without any speed indication just by looking at this vital instrument. Cheers Edited April 21, 2012 by viethson Link to comment Share on other sites More sharing options...
112th_Rossi Posted April 21, 2012 Author Share Posted April 21, 2012 Will an erronous air speed indication affect the TVV? Link to comment Share on other sites More sharing options...
Tornado_Pilot Posted April 22, 2012 Share Posted April 22, 2012 Mhh, interesting question ,though I#m not quite sure about this one. Since the TVV is somewhat of an "impact point" calculated with a given time and speed, it could lead to an erroneous TVV calculation. Link to comment Share on other sites More sharing options...
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