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In the United States, the outer marker has often been combined with a non-directional beacon (NDB) to make a locator outer marker (LOM). An LOM is a navigation aid used as part of an instrument landing system (ILS) instrument approach for aircraft. Aircraft can navigate directly to the location using the NDB as well as be alerted when they fly ...
The aircraft, flying at 3,000 feet (910 m), had been vectored by Boston's approach control to intercept the final approach course to the ILS runway 4R approach at a 45-degree angle, [a] about 2 nautical miles (3.7 km; 2.3 mi) outside the outer marker. [4]
NDBs may designate the starting area for an ILS approach or a path to follow for a standard terminal arrival route, or STAR. In the United States, an NDB is often combined with the outer marker beacon in the ILS approach (called a locator outer marker, or LOM); in Canada, low-powered NDBs have replaced marker beacons entirely. Marker beacons on ...
Just after 8:21 am, ARTC cleared the flight to the San Francisco instrument landing system (ILS) outer marker beacon via the Half Moon Bay fan marker direct to the San Francisco outer marker, with instructions to maintain at least 500 feet (150 m) above all clouds and to contact San Francisco approach control after passing the Half Moon Bay fan ...
ILS approach LM land and marine LMM Locator middle marker LNAV lateral navigation LOA letter of authorization FAA: LOC localizer: LOC loss of control: LOCI loss of control inflight: LOFT line-oriented flight training: LOM limitation of movement LOM locator outer marker: LOPA Location of Passenger Accommodations: LORAN Long-range navigation: LOTC
The take-off was carried out and the No. 4 power lever was retarded to the simulated failure idle position. The pilots climbed to 1,500 ft (457 m) and vectored to intercept the ILS course at the outer marker. The tower granted Flight 5787 permission to either land, make a touch-and-go landing, or make a low approach of the runway at its discretion.
The outer marker beacon for runway 18 was operational, but the middle marker beacon, glide slope, and runway approach lights were inoperative. [ 1 ] : 9 Under these conditions, proper procedure would be to maintain the minimum approach altitude of 1,290 feet (390 m) above mean sea level until the pilots made visual contact with the runway.
While approaching Basel, Flight 435 passed two approach beacons, named as beacons MN and BN, the latter of which was the outer marker of the Instrument Landing System at the airport. However, the aircraft overshot. Captain Dorman then initiated a go-around. [5]