If this is your first visit, be sure to check out the FAQ by clicking the link above. You may have to register before you can post: click the register link above to proceed. To start viewing messages, select the forum that you want to visit from the selection below. |
|
|
Thread Tools | Display Modes |
#11
|
|||
|
|||
I'd like to add that for aerobatic flight, it is common to use QFE, for
obvious reasons. But then, aerobatic flights are usually strictly local. Stefan |
#12
|
|||
|
|||
Flying for 10 years over Northern Germany (which, except for the climate,
could be compared to Northern Florida) I always used a QFE setting with the field 600ft MSL. Airspace regulations weren't that touchy in these days, and sailplane altimeters aren't that precise anyways so there is just no point to have it set at 400ft or 600ft. If you rely on judging your altitude by an altimeter during the pattern for an outlanding, you shouldn't go x-country in the first place. If you run into a high antenna or a tower on a hillside, you should think about getting a new prescription for your glasses. The last 15 years in the mountains are another story though. -- Bert Willing ASW20 "TW" "Stefan" a écrit dans le message de news: ... Kilo Charlie wrote: How about mountains? How about large towers there in the "flatlands" where elevations can vary even there How about looking out of the window? Stefan |
#13
|
|||
|
|||
I've yet to see a glider with an accurately calibrated altimeter. Strange. As they are supposed to be certified instruments, they are required to be checked every two years here in New Zealand. Along with the Transponder and encoder. Paul |
#14
|
|||
|
|||
I was taught to fly in meters above ground and do a mental conversion
by multiplying the meters by three and adding 4 500ft to get the real altitude when speaking to the ATC. I then bought a glider without a meter altimeter - only a ft one which is set to show altitude above sea level. No more problem when speaking to ATC but found I was doing reverse calculations to find out how high I was above the hard stuff. Then I set my palm up with Soaringpilot which now has a digital terrain model built in. Now I know exactly how high I am above the ground - even when I fly cross-country in the mountain regions not far from my airfield. My LX 5000 computer is set up to show my height above my home field, which is more important for final glide than anything else. Clinton Birch LAK 12 |
#15
|
|||
|
|||
In message , T o d d P a t t
i s t writes "BTIZ" wrote: Best to learn the mental math now.. then later when you travel west for the first time. I agree 100%. It has been really interesting to watch this one. I fly in the UK and this is what I have been taught to do: If local then QFE; if XC then QNH; If wave flying then QNE once you go above 3,500 QNH (this is transition round where I am I know it is different in other places). This also applies XC if you are going near a lot of airspace; I am taught to land without reference to the altimeter and I don't think I have ever used it when I carry out field landings. Not that many glider pilots in the UK have radio licences and a fair number of gliders do not have radios so the QNH is not generally updated beyond the departure calculation and setting. Now, I must say that this is a reworking of what I was taught for power, not gliding and I can't remember it ever being laid down specifically what I should do away from local flight other than making sure that I could land and so on without use of the altimeter. Cheers Robin -- Robin Birch |
#16
|
|||
|
|||
T o d d P a t t i s t wrote: It's my understanding that this procedure is also used in airplanes in the U.K. In the U.S., airplanes will only use QNH or QNE (above 18,000') and never use QFE. There is always an exception to any rule. American Airlines used to always use QFE set altimeter for approach and landing in US. I was involved in the development of the MD-11. We developed an altimeter setting system that allowed easy transition between QFE, QNH and STD for the glass cockpit altimeters. American was the only US operator that used that customer option. They would land at Denver with altimeter reading zero after getting QFE setting from local ground ops. (I was involved in development and flight test, not American's ops, so any America Airlines pilots on this forum may correct this). Andy |
#17
|
|||
|
|||
it better be... if the transponder is installed..
BT "Stefan" wrote in message ... BTIZ wrote: you do.. you listen to the local ATIS or ASOS or AWOS or check with FSS or ATC on freq and find out what they are using in the local area I've yet to see a glider with an accurately calibrated altimeter. Stefan |
#18
|
|||
|
|||
BTIZ wrote:
it better be... if the transponder is installed.. BT "Stefan" wrote in message ... BTIZ wrote: you do.. you listen to the local ATIS or ASOS or AWOS or check with FSS or ATC on freq and find out what they are using in the local area I've yet to see a glider with an accurately calibrated altimeter. When I had my biennial check on my transponder, there was no check of the altimeter. They did adjust the encoder to read the current pressure altitude. I know there are strict requirements for encoder and altimeter accuracy for IFR flight, which requires testing the encoder and altimeter up to the altitude they will be used in. Is there some regulation requiring an aircraft with a transponder used in VFR flight to also have an altimeter calibration? I don't think Mode C is required, so perhaps the regulation, if there is one, applies only if an encoder is installed? -- Change "netto" to "net" to email me directly Eric Greenwell Washington State USA |
#19
|
|||
|
|||
I admit to not being up on the current FAR's re altimeters but is there no
regulation for all aircraft in the US to have accurate altimeters? I would like to think that mine is accurate within a certain limit since as this discussion points out it is important. No doubt that in the conditions that we fly in (changing pressure as the day progresses) there is some inaccuracy but in my experience not more than a hundred feet or so and as others have pointed out by tuning in to a local ATIS can be corrected. Those influences are the same for whatever setting you decide to initially use anyway. Casey Lenox KC Phoenix |
#20
|
|||
|
|||
transponders 91.217, and 91.413
91.413 specify a 24 month check even if used for VFR only for the transponder to report accurate altitude AIM 7-2-3, check altimeter against know field elevation and baro setting, if difference is greater than +/- 75ft from the known elevation. The altimeter accuracy is suspect and should be reported to a repair station for evaluation and correction. The altimeter and transponder must be checked every 24 months for operations in IFR. (91.411) That is the only VFR "check" of the altimeter that I have found tonight. But if the altitude or altitude reporting function (blind encoder) reports altitude to the transponder, it must be checked every 24 months. If you don't have a transponder, and you never fly IFR, if the baro setting displays within 75ft of field elevation. It's "good to go". BT "Eric Greenwell" wrote in message ... BTIZ wrote: it better be... if the transponder is installed.. BT "Stefan" wrote in message ... BTIZ wrote: you do.. you listen to the local ATIS or ASOS or AWOS or check with FSS or ATC on freq and find out what they are using in the local area I've yet to see a glider with an accurately calibrated altimeter. When I had my biennial check on my transponder, there was no check of the altimeter. They did adjust the encoder to read the current pressure altitude. I know there are strict requirements for encoder and altimeter accuracy for IFR flight, which requires testing the encoder and altimeter up to the altitude they will be used in. Is there some regulation requiring an aircraft with a transponder used in VFR flight to also have an altimeter calibration? I don't think Mode C is required, so perhaps the regulation, if there is one, applies only if an encoder is installed? -- Change "netto" to "net" to email me directly Eric Greenwell Washington State USA |
Thread Tools | |
Display Modes | |
|
|
Similar Threads | ||||
Thread | Thread Starter | Forum | Replies | Last Post |
Reading back altimeter settings? | Paul Tomblin | Piloting | 31 | April 12th 05 04:53 PM |
ATC Altimeter Settings | O. Sami Saydjari | Instrument Flight Rules | 81 | April 11th 05 08:07 PM |
Local altimeter at BFM | Dan Luke | Instrument Flight Rules | 3 | June 15th 04 02:01 PM |
Altimeter setting != Sea Level Pressure - Why? | JT Wright | Piloting | 5 | April 5th 04 01:04 AM |
Altimeter experience | HankC | Piloting | 2 | July 25th 03 09:43 PM |