- Major Modifications
- Special Configurations
- 3rd Line Modifications
- B/26 Introduction of Marconi Doppler Navigation System
- B/33 Installation of 618T-2 HF Radio Equipment
- B/37 Installation of AN/ARN501(V) TACAN
- B/111 Retrofit of AN/AQS-13 Sonar
- B/132 Installation of Gyroscopic Heading and Attitude Reference System (GHARS)
- B/138 Installation of Clock Type A-13A-2 as an Alternate to A-13A
- B/150 Installation of AN/ASN-501
- B/185 Utility Rescue Conversion
- B/187 Installation of DCU41/A Armament Control Panel
- CD-319 AN/AQS-13 Sonar Improvements
- CD-363 Installation of On-top Position Indicator
- CD-378 Incorporation of APX-77A Radar Identification System in CH124A Aircraft
- CD-382 Secure Voice Equipment Installation
- CD-414 Design Improvements to TACCO Table
- CD-426 Installation of APN-171(V)
- CD-427 Installation of AN/ARC511(V) and AN/ARC513(C) Fixed Fittings
- CD-428 Installation of AN/ARR-52A Sonobuoy Receiving Set
- CD-431 Relocation of KY-28 Secure Voice Equipment
- CD-439 Advanced Developmental Special Avionics Installation
- CD-440 Advanced Developmental MAD Installation
- CD-444 Installation of AN/APN513 Doppler
- CD-455 Installation of AN/ARC 164(V) UHF Radio Communication System
- CD-456 Installation of the KY58/KY75 Secure Voice Systems
- CD-460 Helicopter Towed Array Support (HELTAS) System Installation
- CD-463 Installation of the AN/ARN-127 VOR/ILS/Marker Beacon Navigation System
- CD-466 Forward Looking Infrared (FLIR) System Mission-fit Installation
- CD-467 Relocation of Avionics Equipment to Improve Centre OF Gravity
- CD-471 AN/ASN123C Tactical Navigation System Installation (CH124A)
- CD-476 CH124B Conversion Program Removal of the ARR-75 Sonobuoy Receiver System
- CD-478 CH124B Conversion Program Removal of the UYS-503 Sonobuoy Processor System
- CD-479 CH124B Conversion Program Removal of the 2ARC-164(V) UHF Sonobuoy Command System
- CD-480 CH124B Conversion Program Removal of the TD5062/AS Time Code Generator System
- CD-481 CH124B Conversion Program Removal of the M14E Tape Recorder System
- CD-482 CH124B Conversion Program Removal of the ASQ-504(V) Magnetic Anomaly Detector Capsule System
- CD-483 CH124B Conversion Program Installation of the “A” Model FLIR Display in the Side-facing Console
- CD-486 CH124B Conversion Program Removal of the Internal Sonobuoy Dispenser System
- CD-498 CH124B Conversion Program Removal of the VHF-FM ARC 513 System
- 1st and 2nd Line Modifications
- A/16 Re-arrangement of Instrument Panel
- A/25 (Reserved) C1607/ARC-52 Control Panel – introduction of
- A/60 Replacement of Pilots and Copilots Bearing and Distance Heading Indicators
- A/63 Introduction of Airspeed Indicator P/N B12963-10-016
- A/68 (Reserved) Incorporation of 671-CLU-4-035 RCN-1 Altimeter
- A/139 (Reserved) Re-identification of Component Parts from AN/ARC-94 to AN/ARC-505(B)
- A/163 Relocation of IFF and SIF Control Boxes
- A/190 AN/ASQ-501 Acceptable Alternate for AN/AQS-13
- A/217 Incorporation of Table Assembly ASN-501 Console
- A/242 Wiring Change to Bypass ASN-501 Variation Control
- A/243 Additional Intercom Installation
- A/274 Repositioning of BDHI on ASN-501 Console
- A/313 BDHI Control Panel
- CF-372 Installation of AN/ARN504(V) TACAN
- CF-410 Installation of Transmit Control Panels on Sideways Facing Sensor Station
- CF-430 Replacement of KE-28 Deviation Compensated Adapter with CRA2-2A Synchro Signal Amplifier
- CF-454 Repositioning of Sonar Operator’s Intercom Control Panels
- CF-554 Installation of Clearing Switch on Stores Load Select Panel (TACCO)
- CF-581 Introduction of a CH124A Internal Store Information Panel
- CF-601 Installation of Sonar Cable Payout Monitor II
- CF-644 (Cancelled) Installation of a Laser Warning Receiver (LWR)
- CF-645 (Cancelled) Installation of a Global Positioning System (GPS)
- CF-646 (Cancelled) Installation of a Infrared Countermeasures Set (IRCM) ALQ-144(V)
- CF-647 (Cancelled) Installation of a M-130 Flare Dispenser System
- CF-648 (Cancelled) Installation of a Forward Looking Infrared System (FLIR 2000[G])
- CF-651 (Cancelled) Installation of a ECM Dispensing System ALE 37
- CF-652 (Cancelled) Installation of a Radar Warning Receiver (RWR) N/APR-30(V)
- CF-654 (Cancelled) Missile Alert WarningSystem (MAWS)
- CF-686 Installation of Global Positioning System (GPS)
- CF-706 ASN-123C Tactical Navigation System Interface with the Sonobuoy Dispenser System
- CF-707 ASN-123C Tactical Navigation System Interface with APN-171 Radar Altimeter
- CF-721 Have Quick II Installation CH124 Sea King Helicopter
- CF-722 ASN-123C Tactical Navigation System Interface with GPS and AN/ASN-123C RevH Software Installation
- CF-728 Doppler/ASN123C Interface – CH124B Aircraft
- CF-729 Doppler/ASN123C Interface – CH124 HAPS Aircraft
- CF-730 Doppler/ASN123C Interface – CH124A Aircraft
- CF-750 Installation of the AN/ALQ-144 Infrared Countermeasures
- CF-751 Replacement of AN/UYS-503(V)4 Processor PN 159593-903 with PN 159593-904 for the Installation of Software Upgrade SCON(V)3 and GCON(V)6
- CF-754 AIC14 Intercom Upgrade
- CF-757 ASN-123 Tactical Navigation Sonar Interface Wiring Installation (For use with Revision H2C)
- CF-758 ASN-123 Tactical Navigation Interface Wiring Installation – CH124A
- CF-777 Installation of ARC 210 Radio System on a CH124B Helicopter
- CF-804 CH124A/B Night vision Imaging System Lighting Compatibility Conversion
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