Old 2 Colour ILS Displays....any info?/Pictures
Join Date: Sep 1999
Location: UK
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Hi,
No picture, but I can describe it (I think!)
Glidepath needle hinged middle left of instrument, sweeping up/down as appropriate. Usual dot deflections indicated.
Similarly the Localizer, hinged at the top, sweeping over a two-couloured scale at botton. Yellow section LEFT and Blue section RIGHT, resp 90 and 150 Hertz signals modulated onto the VHF frequency. Again usual 4 dots left/right depicted in middle of instrument. Just like existing ILS VORLOC indicators: needle left-fly left etc. However gave reverse indications on BackBeam approaches.
End of memory. Hope it helps
No picture, but I can describe it (I think!)
Glidepath needle hinged middle left of instrument, sweeping up/down as appropriate. Usual dot deflections indicated.
Similarly the Localizer, hinged at the top, sweeping over a two-couloured scale at botton. Yellow section LEFT and Blue section RIGHT, resp 90 and 150 Hertz signals modulated onto the VHF frequency. Again usual 4 dots left/right depicted in middle of instrument. Just like existing ILS VORLOC indicators: needle left-fly left etc. However gave reverse indications on BackBeam approaches.
End of memory. Hope it helps
Staple - No, you aren't. I'm looking at a picture of an old one as described by 4REDS. There is no beam bar, just the two needles to represent LLZ and GP. At the top there is a scale on which you set LLZ QDM and at the bottom the reciprocal of the scale at the top. The blue and yellow are permanently painted to the left (blue) and right (yellow) of the vertical centreline of the instrument.
Sorry I can't send a pic electronically, but I found it in an old "Aerad Nav Trainer Manual" (1975, Bramson & Birch). Maybe you can find a copy...
Sorry I can't send a pic electronically, but I found it in an old "Aerad Nav Trainer Manual" (1975, Bramson & Birch). Maybe you can find a copy...
Last edited by keithl; 28th Dec 2004 at 12:58.
This is difficult, memory fades, but either Bendix or Sperry did an H.S.I. that was fitted to something old, I can’t remember but it was either old ex Pan – Am 707s or old 747s or even A300B4s. Anyway it was a mechanical wonder and the whole of the deviation mechanism, including the scale, rotated along with the pre-set course pointer. In VOR use the whole thing was a white on black presentation with a red fail flag. In ILS use you had to set the course pointer to the runway QDM the red fail flag was biased out of view and replaced with a Glide slope scale which also rotated with the assembly. I think there was a red flag that covered the scale until an adequate G/S signal was being received. The Localiser flag was a Blue and Yellow affair that came into view with an adequate signal and was lined up with the Course pointer.
I have also seen, in the dim and distant past an indicator which again was a rotating mechanism, allowing setting of QDM which had a fixed G/S presentation at the side of the instrument, a rotating Loc scale at the top of the rotating bit and the Loc pointer (the whole thing) was painted blue/yellow. It was like a dart with the point working against the scale. In VOR use it was all biased out of view and replaced with a conventional white on black presentation. I am struggling to remember where I saw that and am leaning to a pretty old F27 which would have been Loganair longer ago than I care to think about.
The fixed instrument, described above was also quite common at one time, seen a few of those.
I have also seen, in the dim and distant past an indicator which again was a rotating mechanism, allowing setting of QDM which had a fixed G/S presentation at the side of the instrument, a rotating Loc scale at the top of the rotating bit and the Loc pointer (the whole thing) was painted blue/yellow. It was like a dart with the point working against the scale. In VOR use it was all biased out of view and replaced with a conventional white on black presentation. I am struggling to remember where I saw that and am leaning to a pretty old F27 which would have been Loganair longer ago than I care to think about.
The fixed instrument, described above was also quite common at one time, seen a few of those.
