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Thread Tools | Display Modes |
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Random thoughts 2
Is it legal/possible/reasonable to install just Mode A transponder (No
altitude reporting)? Whenever I hear "Traffic 12 O-clock 3 miles, altitude unknown" I look EVERYWHERE. ahead. Might this provoke more visual scanning by aircraft crews which could spot gliders without transponders in the same gaggle? A case of one protecting all? As a side benefit this would avoid the 24 months Mode C altimeter/encoder check. Bill Daniels |
#2
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Random thoughts 2
Bill Daniels wrote: Is it legal/possible/reasonable to install just Mode A transponder (No altitude reporting)? Whenever I hear "Traffic 12 O-clock 3 miles, altitude unknown" I look EVERYWHERE. ahead. Might this provoke more visual scanning by aircraft crews which could spot gliders without transponders in the same gaggle? A case of one protecting all? As a side benefit this would avoid the 24 months Mode C altimeter/encoder check. Bill Daniels Sure, anything is possible/ and/or reasonable. As far as legal goes, remember if you have an instrument of any kind installed, you are required by regulation to have it signed off by an A/P in your aircraft log book. Additionally some reference to weight and bal. should also be noted even if it's only to say, "no significant weight change." If you put a transponder in your glider - either with or without an encoder - it needs to be calibrated and so noted in your aircraft log book. You are then required to have checked every twenty-four months. If you are going to put a transponder in the glider, then spring for an encoder - In for a penny, in for a pound and all that. Without the encoder ATC as well as TCAS only gets azimuth and range. With the encoder you get the third demension, altitude. Sure beats ending up in Denver as a pitot cover on a B-767! Billy Hill, Zulu |
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Random thoughts 2
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#5
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Random thoughts 2
Bill Daniels wrote: As a side benefit this would avoid the 24 months Mode C altimeter/encoder check. Bill Daniels I had my Mode C transponder in for it's 24 month checkup in April. Fifty bucks! How much are you paying for tows? Matt Herron |
#6
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Random thoughts 2
BTIZ wrote:
BT "flying_monkey" wrote in message oups.com... wrote: . . . snip . . . If you put a transponder in your glider - either with or without an encoder - it needs to be calibrated and so noted in your aircraft log book. You are then required to have checked every twenty-four months. If you are going to put a transponder in the glider, then spring for an encoder - In for a penny, in for a pound and all that. Without the encoder ATC as well as TCAS only gets azimuth and range. With the encoder you get the third demension, altitude. Sure beats ending up in Denver as a pitot cover on a B-767! Billy Hill, Zulu Zulu, Having owned a few junky older airplanes (like old Bonanzas) with only Mode A transponders, I can't recall any requirement for calibration or any recurrent inspection of these. If you're flying IFR, you have to have a pitot/static check every two years, and if you have Mode C, you have to have the encoder calibrated, but I wasn't aware of anything other than that. 91.413(a) requires 24 month inspection of any transponder to be used in airspace defined by 91.215 It makes no reference to VFR or IFR flight. I can't find any reference in 91.413(a) to encoder calibration, and when I have the required 2 year test done, only the encoder reading at field elevation is checked. So, I don't think the encoder calibration check is required for VFR operation. Do you know of a regulation requiring it? -- Change "netto" to "net" to email me directly Eric Greenwell - Washington State, USA www.motorglider.org - Download "A Guide to Self-launching Sailplane Operation" |
#7
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Random thoughts 2
"Eric Greenwell" wrote in message news:chOJg.10062$XD1.1965@trnddc01... BTIZ wrote: BT "flying_monkey" wrote in message oups.com... wrote: . . . snip . . . If you put a transponder in your glider - either with or without an encoder - it needs to be calibrated and so noted in your aircraft log book. You are then required to have checked every twenty-four months. If you are going to put a transponder in the glider, then spring for an encoder - In for a penny, in for a pound and all that. Without the encoder ATC as well as TCAS only gets azimuth and range. With the encoder you get the third demension, altitude. Sure beats ending up in Denver as a pitot cover on a B-767! Billy Hill, Zulu Zulu, Having owned a few junky older airplanes (like old Bonanzas) with only Mode A transponders, I can't recall any requirement for calibration or any recurrent inspection of these. If you're flying IFR, you have to have a pitot/static check every two years, and if you have Mode C, you have to have the encoder calibrated, but I wasn't aware of anything other than that. 91.413(a) requires 24 month inspection of any transponder to be used in airspace defined by 91.215 It makes no reference to VFR or IFR flight. I can't find any reference in 91.413(a) to encoder calibration, and when I have the required 2 year test done, only the encoder reading at field elevation is checked. So, I don't think the encoder calibration check is required for VFR operation. Do you know of a regulation requiring it? -- Change "netto" to "net" to email me directly Eric Greenwell - Washington State, USA www.motorglider.org - Download "A Guide to Self-launching Sailplane Operation" Eric, you are correct.. the encoder for altitude calibration is not in 91.413(a), that part is in 91.411 and 91.411 only refers to IFR requirements, not VFR. The 91.413(a) check verifies that the 4096 code dialed in is the code transmitted and has nothing to do with altitude. VFR only aircraft require 91.413 every 24 months.. IFR capable aircraft require 91.413 and 91.411 every 24 months.. So if you have the encoder and plan to go into Class A airspace... is the 91.411 required in a VFR only aircraft? It's all part of the same check.. when you get the 91.413 done, and you have an encoder, get the 94.411 done. The 91.411 also includes a pitot static check. BT |
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