Land with zero vision
The US FAA is proposing to let pilots use enhanced flight vision systems in lieu of natural vision to land in zero visibility.
The Authority is proposing to permit operators to use EFVS in lieu of natural vision to continue descending from 100 ft above the touchdown elevation to the runway and land during some straight-in instrument approach procedures under instrument flight rules (IFR).
The proposal would also permit some operators using EFVS-equipped aircraft to take-off under IFR, as well as to initiate and continue an approach when the destination airport weather is below authorised visibility minima for the runway.
Under the proposal, pilot training, recent flight experience and proficiency would be required for operators who use EFVS in lieu of natural vision to descend below decision altitude/height.
But EFVS-equipped aircraft conducting operations to touchdown and roll-out would be required to meet additional airworthiness requirements. This proposal would also revise cockpit view certification requirements for vision systems using a transparent display surface located in the pilot’s outside view - a head-up display (HUD).
The FAA explains that EFVS uses real-time imagery derived from imaging sensors such as forward-looking infrared, millimetre wave radiometry, millimeter wave radar or low-light-level intensification. But synthetic vision systems - computer-generated images of the external scene derived from a database of terrain and obstacles - are not included in the new rule.
Details from the FAA below.