![]() ![]() There is evidence of slight moisture ingress just under the glass (white glaze), but otherwise it is in very good condition. It is in relatively good condition given its age. These instruments were developed in conjunction with the US Army Signal Corps, hence it's stamp on the rear case. This instrument was eventually removed from an aircraft of the US Navy on or about 1954 as evidenced by its yellow date stamp from Naval Air Station (NAS) Alameda (CA). See images in photo gallery from the Instrument Approach System Manual dated 1943 (the full manual can be downloaded by clicking here). If the aircraft was angled below the correct glide path (which would cause the aircraft to land short of the runway), the right end of the horizontal needle would angle upwards, directing the pilot to decrease the angle of descent. If the aircraft was angled above the correct glide path (in which case the aircraft would overshoot the runway), the right end of the horizontal needle would angle downward, directing the pilot to increase the angle of descent. If the aircraft was approaching the runway on the correct glide path, the horizontal needle would align with the indicator's horizontal centerline as shown in the photograph. If the aircraft was right of the runway, the vertical needle would appear to the left of the centerline, and vice versa. If the aircraft was approaching along centerline of the runway, the vertical needle would appear centered on the indicator's vertical centerline as shown in the photograph. The system was used across many bomber and transport aircraft of the US Army Air Force and the US Navy. Used in conjunction with the Radio Bearing Indicator (i.e., Radio Compass), the indicator guided the pilot to the correct course and glide path for a proper landing in conditions of poor visibility. RUNAWAY VISUAL RANGE (RVR) : In order to land, the pilot must be able to see appropriate visual aids not later than the arrival at the decision height (DH) or the missed approach point (MAP).This is a WWII-era Pilot's Localizer/Glide Path Indicator used in the Modified A-1 Runway Localizer System of the Instrument Approach System of the US Army Air Force and US Navy.Any or all of the following lighting systems may be provided at a given facility: approach light system (ALS), sequenced flashing light (SFL), touchdown zone lights (TDZ) and centerline lights (CLL-required for Category II & III operations.)� The approach lighting system:-Various runway lighting systems serve as integral parts of the ILS system to aid the pilot in landing.DME : Distance Measuring Equipment (DME) is normally collocated with glide path and provides slant distance to the aircraft with respect to touch down point.The middle marker crosses the glide slope at approximately 200 to 250 ft above the runway elevation. (ii) MIDDLE MARKER (MM): The middle marker ( if installed) is located approximately 0.5 to 0.8 NM from the threshold on the extended runway centerline. (i) Outer marker (OM): The outer marker (if installed) is located 3 1/2 to 6 NM from the threshold within 250 ft of the extended runway centreline to provide the pilot with the ability to make a positive position fix on the localizer. Glide path �is located 750 to 1,250 feet (ft) down the runway from the threshold (shown above), offset 400 to 600 ft from the runway centre line. Glide Path:- The glide path component of ILS �provides vertical guidance to the pilot during the approach.The transmitter and antenna (Shown above) are on the centreline at the opposite end of the runway from the approach threshold. Localizer:- The primary component of the ILS is the localizer, which provides lateral guidance. ![]() ![]() When all components of the ILS system are available, including the approved approach procedure, the pilot may execute a precision approach. The ILS provides the lateral and vertical guidance necessary to fly a precision approach. Instrument landing system (ILS) facility is a highly accurate and dependable means of navigating to the runway in IFR conditions. ILS stands for Instrument Landing System and is a standard International Civil Aviation Organisation (ICAO) precision landing aid that is used to provide accurate azimuth and descent guidance signals for guidance to aircraft for landing on the runway under normal or adverse weather conditions. ![]()
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