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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 ...
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
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 ...
In aviation, the instrument landing system (ILS) is a precision radio navigation system that provides short-range guidance to aircraft to allow them to approach a runway at night or in bad weather. In its original form, it allows an aircraft to approach until it is 200 feet (61 m) over the ground, within a 1 ⁄ 2 mile (800 m) of the runway.
A marker beacon is a specialized beacon used in aviation, in conjunction with an instrument landing system (ILS), to give pilots a means to determine distance to the runway. Marker beacons transmit on the dedicated frequency of 75 MHz. This type of beacon is slowly being phased out, and most new ILS installations have no marker beacons.
One of the primary benefits of TLS is the ability to provide precision ILS guidance where terrain is sloping or uneven. Reflections can create an uneven glide path for ILS causing unwanted needle deflections. Additionally, since the ILS signals are pointed in one direction by the positioning of the arrays, ILS only supports straight-in approaches.
Localizer as component of an ILS (KMEZ runway 27, Mena, Arkansas) Emission patterns of the localizer and glide path signals. An instrument landing system localizer, or simply localizer (LOC, [1] or LLZ prior to 2007 [2]), is a system of horizontal guidance in the instrument landing system, which is used to guide aircraft along the axis of the runway.
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.