EVS-3600 − Automatic NUC functionality

Effectivity: Global 5500/6000/6500/7500 aircraft 

ATA: 34-33 

By: Dan Martin – Technical Services 

The EVS-3600 camera is standard equipment on Global 7500 aircraft. For Global 5500/6000/6500 aircraft, the EVS-3600 was introduced as standard equipment with a cut-in effectivity at A/C 60131, via SB 700−34−5520 (Global 5500); SB 700−34−6038 the Global 6000; or SB700-34-6519 for the Global 6500. These Service Bulletins can only be installed at authorized Bombardier completion centres for incorporation before delivery, and no in-service retrofit is possible for the delivered aircraft with the CMA-2700 EVS camera. 

On the HUD/EVS control panel of the glareshield, the HUD CVS rotary knob (Global 7500) or the CVS rotary knob (Global 5500/6000/6500), there is a PUSH/EVS CAL centre button that, when pressed for one second, commands a Non-Uniformity Correction Calibration (NUC) of the EVS camera. The NUC option can be used to fix any visual noise or irregularities in the EVS image, enhancing image quality. 

Specific to the EVS-3600 camera, an automatic NUC will be performed by the EVS system under certain conditions. This auto NUC will occur when the EVS camera’s focal plane array temperature changes by more than 4°C or every 15 minutes since the previous NUC. The auto NUC is disabled during taxi, takeoff, approach and landing.  On the ground, auto NUC is inhibited when the airplane is in motion. On takeoff roll and initial climb, auto NUC is inhibited until the airplane is above 1,200 feet radio altitude (RA). On approach for landing, auto NUC is inhibited at 1,000 feet RA down to the ground.  

When the auto NUC occurs, the EVS image will go blank for approximately one second on the HUD and AFD displays. No annunciation is provided during auto NUC. 

The auto NUC functionality was not sufficiently detailed in the Flight Crew Operating Manuals (FCOM) or in the Collins-supplied HUD Pilot Guides. The description of the EVS-3600 camera auto NUC will be included in the next revisions of the FCOM 2 and HUD Pilot Guides. 

Operators should be familiar with the EVS-3600 camera auto NUC functionality to avoid unnecessary troubleshooting.