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  • Source: AN/ALQ-172

    • AN/ALQ-172 is an integrated airborne defensive electronic countermeasure system for the B-52 Stratofortress, MC-130E Combat Talon, MC-130H Combat Talon II, AC-130H Spectre and AC-130U Spooky. Originally produced by ITT Defense & Electronics Corp (now part of L3Harris Technologies) in the early 1980s, it was designed to improve low-level penetration survivability of the B-52.


    History


    A study in 1996 by analysts of the Battelle Memorial Institute determined problems with repair of the ALQ-172 resulted in the highest cost per flying hour (CPFH) of any system on the B-52. The United States Air Force instituted Engineering Change Proposal (ECP) 93 modifying the system's memory and processing capability. By fiscal year 1997 (FY97), it also reported a second system was needed on the aircraft for full threat protection.
    Also in FY96, Air Staff directed the ALQ-172 be installed on AC-130H gunships replacing the non-supportable AN/ALQ-131 jamming pods. Also installed on special operations forces (SOF) AC-130U, MC-130H and MC-130E aircraft, two subsystems were installed; one forward and one aft, with a single common display and control unit. Other engineering differences on these aircraft involved adding low-band transmitters, antennae and antenna control units.
    Upgrades have incorporated geolocation capabilities, advanced countermeasures and new technologies. Nine Line-replaceable units (LRUs) have been upgraded, with five of those tested as of mid-2024. The upgrades are part of the maintainability and reliability system (MARS) upgrade; a 10-year, $947 million project enhancing the performance of the B-52's electronic countermeasures systems. With continuing support and upgrades, the ALQ-172 is expected to be in service well into the 2040s.


    Technical description




    = Features

    =
    Integrated with aircraft controls and displays, the system provides countermeasures capabilities for multiple sophisticated pulse, continuous wave, doppler and monopulse threats simultaneously. Using digital frequency discrimination (DFD) technology, the system is capable of determining pulse width, angle of arrival (AOA), and pulse-repetition frequency (PRF) of threat signals, deinterleaving and processing them.
    In accordance with the Joint Electronics Type Designation System (JETDS), the AN/ALQ-172 designation represents the 172nd design of an Army-Navy electronic device for an electronic countermeasures system. The JETDS system also now is used to name Air Force systems.


    = Characteristics

    =
    Weight per aircraft: 1,631 pounds
    LRUs per system: 7
    Systems per aircraft: 2
    Antennas per aircraft: 7
    Systems produced: 943 (over 6,000 LRUs)


    Variants


    AN/ALQ-172(V)
    AN/ALQ-172(V)1 - on AC-130U and MC-130H aircraft
    AN/ALQ-172(V)2
    AN/ALQ-172(V)3 - on AC-130H Gunships


    See also



    AN/ALQ-99 – Airborne electronic warfare system pod
    AN/ALQ-101 – Military aircraft radar electronic countermeasures (ECM) podPages displaying short descriptions of redirect targets
    AN/ALQ-135 – Military aircraft electronic countermeasures (ECM) jamming system
    AN/ALQ-218 – Military aircraft passive radar warning receiver (RWR) system
    List of military electronics of the United States
    Joint Electronics Type Designation System – Unclassified designation system for United States military electronic equipment


    References




    External links


    AF.mil - B-52H Stratofortress Fact Sheet

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