LASEREF IV upgrade details

About the LASEREF series

The new configuration of the LASEREF IV delivers a lighter, simplified unit replacement with enhanced reliability, standard digital communication bus outputs, and easier maintenance. Together, these improvements result in the lowest cost of ownership for inertial reference systems.

Honeywell’s LASEREF series has been the standard for the commercial aerospace market since its’ entry to service in 1997.
Designed to meet safety-critical Design Assurance Level A (DAL A) requirements with applicable civil Technical Standard Order (TSOs).
The Gyro compass eliminates the need for magnetic sensors, and supports heads-up display (HUD), synthetic
vision system (SVS), and high-bandwidth SATCOM installations.
Meets requirements for required navigation performance with authorized Required Navigation Performance
Authorization Required (RNP AR) approaches with 100% availability.
The internal reference unit (IRU) serves as a global navigation satellite system GNSS-denied navigation solution with complete on-aircraft autonomous navigation capability in the advent of GNSS interruption or jamming

Trade in, trade up

Rebates are available through Honeywell when completing all available or remaining upgrades on applicable aircraft when trading in LASEREF II and LASEREF III units.

Features and benefits

Automatic re-align function for post-flight alignments
Auto-calibration of the sensors to maintain optimal performance over time
High-latitude alignment up to 78.25 degree North latitude
High-latitude magnetic heading map
Improved cost of maintenance with a modular design and assembly
Interchangeable with LASEREF II (using adapter tray) and LASEREF III (no adapter tray required)
Uses the industry standard GG1320 digital gyro
Capable of being updated to latest magnetic variation tables to maintain IFR precision
Interfaces with Honeywell’s HG2021 GNSSU ARINC 743A receiver to provide optimal GPS / internal hybrid computations
Mean time between failures (MTBF) consistently exceeds 40,000 hours
Mean time between unscheduled removals (MTBUR) more than 20,000 hours since service entry in 1997
25 pounds lighter than LASEREF II
10 pounds lighter than LASEREF III
30% improvement in demonstrated reliability
Provides ARINC 429 and aircraft standard digital communication bus outputs

Applicable aircraft platforms

Dassault: F900 A/B, F900 C/EX, F50, F2000
Bombardier: CL-600/601-3A/3R, Global Express
BAE Hawker: -800, 800 XP (BAE 125), -1000
Cessna Citation X
Gulfstream: G-IV/SP, G-V

LASEREF part numbers and pricing

HG2001GD03, HG2001GD15, HG2001GD40 | 2026 Honeywell Sales Bulletin price: $183,715 ea.
Tray Adapter: part number: WG2000AA03 | 2026 Honeywell price $5,500 ea.