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Friday 4th July 2008
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Brainteasers Interactive Quiz #11:
Terrestrial Navaids

With all the emphasis on satellite-based navigation these days, discussions of those 1950's technology groundbound anachronisms -- VOR, DME and ILS -- may seem passe. But since we're going to be living with them for at least another decade, let's see how much you remember about these soon-to-be-nostalgic navaids.

by Mike Busch

The questions is this Brainteaser quiz are based on the AIM.

Answer the questions as best you can, then click on the "score" button to see your score and read the explanations. If you don't like your score the first time around, you can change some of your answers and resubmit. To get the most out of this quiz, we suggest you keep trying until you get a perfect score.

1. The only positive method of identifying a VOR is by listening to its identification, which may consist of:
a. the station's three-letter identifier transmitted in Morse code every 8-10 seconds.
b. a recorded voice that states the station's name followed by the word "VOR".
c. alternating Morse code and voice identification.
d. (a) or (b), but not (c).
e. (a) or (c), but not (b).
f. (a), (b) or (c).
2. You are flying a single-engine airplane with a three-bladed constant-speed prop. Using a cruise power setting of 23 inches of manifold pressure and 2400 RPM may interfere with the accuracy of VOR navigation.
a. True.
b. False.
3. A VOR test facility (VOT) transmits a test signal that should be received as:
a. 000 degrees "TO" or 180 degrees "FROM".
b. 000 degrees "FROM" or 180 degrees "TO".
4. FAR 91.171 requires that prior to flight under IFR, VOR receiver accuracy must have been checked within the past 30 days. How often must localizer and glideslope receiver accuracy be checked according to the FARs?
a. Within the past 30 days.
b. Within the past two years as part of the biennial IFR certs.
c. There is no requirement to ever check LOC/GS accuracy.
5. In VOR/DME, VORTAC, ILS/DME and LOC/DME facilities, the DME transmitter is identified by a Morse code identifier that:
a. repeats every 8-10 seconds, alternating with the VOR or LOC identifier.
b. repeats half as often as the VOR or LOC identifier (about every 15-20 seconds) and is synchronized with it.
c. repeats once for each three or four times the VOR or LOC identifier occurs (about every 30 seconds) and is synchronized with it.
6. The standard service volume of a low-altitude VOR (LVOR) is 40 nautical miles from 1000 feet AGL to 18,000 feet AGL. Consequently, segments of Victor airways between two LVORs are normally no greater than 80 NM in length.
a. True.
b. False.
7. Localizers and VORs operate in the same VHF frequency band, but you can always distinguish a LOC frequency because:
a. it is always in the frequency range 108.00 to 111.95 MHz.
b. it always has an odd digit to the right of the decimal point.
c. both (a) and (b).
d. trick question: there's no way of telling if a particular frequency is assigned to a LOC or VOR.
8. On an ILS, how wide are the localizer and glideslope beams (full-scale to full-scale)?
a. Localizer is 3 degrees wide, glideslope is 1.4 degrees wide.
b. Localizer is 6 degrees wide, glideslope is 3 degrees wide.
c. Localizer is 3 to 6 degrees wide, depending on runway length; glideslope is 1.4 degrees wide.
d. Localizer is 6 to 12 degrees wide, depending on runway length; glideslope is 3 degrees wide.
e. Localizer is 3 to 6 degrees wide, glideslope is 1.4 to 3 degrees wide; both depend on runway length.
9. ILS marker beacons have a rated power output of 3 watts or less and an antenna array designed to produce an eliptical pattern with dimensions, at 1,000 feet above the antenna, of approximately:
a. 2,400 feet in width and 4,200 feet in length.
b. 4,200 feet in width and 2,400 feet in length.
c. one NM in width and 1,200 feet in length.
10. Disturbances to ILS localizer and glideslope courses may occur when surface vehicles or aircraft are operated near the localizer or glideslope antennas. Consequently, "ILS critical areas" are established at most ILS airports, and control towers are required to keep aircraft and vehicles clear of these areas whenever an aircraft is making an ILS approach and:
a. has reported passing the final approach fix.
b. the reported weather is less than 800 and 2.
c. has advised the tower than it is conducting a coupled or auto-land approach.
d. (b) or (c).
e. (a), (b) or (c).

If you enjoyed taking this interactive quiz and would like to see more like it, please let us know. And if you thought it was unfair, confusing, or a waste of time, we'd like you to tell us that, too. And if you have an idea for a subject that you think would make a good future Brainteaser quiz, be sure to let us know.

Return to the AVweb Brainteasers page.






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If you enjoyed taking this interactive quiz and would like to see more like it, go to the AVweb Brainteaser page. And if you thought it was unfair, confusing, or a waste of time, we'd like you to tell us that, too. And if you have an idea for a subject that you think would make a good future Brainteaser quiz, be sure to let us know.

Return to the AVweb Brainteasers page.

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