FAA’s Latest 5G Airworthiness Directive Revises Landing Requirements for Most 737s
A brand-new airworthiness instruction (AD) released by the Federal Aviation Administration on Wednesday recognizes harmful disturbance from 5G C-Band wireless broadband operations that might avoid radio altimeters on most Boeing 737s from carryingout their meant function.
The mostcurrent 5G C-Band instruction needs operators of all 737s—except for Model 737-200 and -200C series aircrafts gearedup with a particular flight control system— to modify their aircraft flight handbook (AFM) to integrate particular operating treatments for instrument landing system (ILS) approaches, speedbrake implementation, go-arounds, and missedouton approaches, when in the existence of 5G C-Band disturbance. FAA authorities provided the ADVERTISEMENT after getting brand-new information reported by Boeing over the last month, as the airplane producer hasactually been constantly examining and screening the effect of 5G C-band on its airplane and consequently providing updates to clients about their mostcurrent findings.
Based on information reported by Boeing, the firm figuredout that the -200 and -200C series equipped with the SP-77 flight control system are not vulnerable to 5G C-Band disturbance. The ADVERTISEMENT associates this exception to the SP-77’s absence of autoland and flare modes, 2 of the primary functions affected by the disturbance on the other designs that will need an AFM modification under the brand-new instruction.
An approximated 2,442 U.S.-registered airplane are impacted by the ADVERTISEMENT and the AFM modification will expense 737 operators a integrated $207,570, according to the instruction.
“The FAA identified abnormalities due to 5G C-Band disturbance might impact several other aircraft systems utilizing radio altimeter information, regardless of the technique type or weathercondition. These abnormalities might not be obvious upuntil extremely low elevations,” FAA notes in the ADVERTISEMENT. “Impacted systems consistof, however are not minimal to, auto-pilot flight director system; autothrottle system; flight controls; flight instruments; traffic alert and accident avoidance system (TCAS); ground distance caution system (GPWS); and setup cautions.”
Among the results on the systems recognized as those that rely on radio altimeter information, there is a possibility that the auto-pilot might detach throughout approaches that usage ILS or Ground Based Augmentation System (GBAS) treatments. Data reported to the FAA by Boeing likewise revealed that 737 design autothrottles “may slowdown to idle toosoon in the flare.” Traffic Collision Avoidance System (TCAS) and radio altitude-based informs might likewise endedupbeing notavailable due to 5G C-Band disturbance.
The instruction is the mostcurrent provided by the ADVERTISEMENT targeting 737 designs, after publishing a regulation last month that modified landing requirements on 737 MAX airplane. Directives have likewise been provided relatingto landing requirements for the Boeing 747-8, 757, 767 and 777.
“The ADVERTISEMENT does not use to landings at airports where the FAA identified the airplane radio altimeters are safe and trustworthy in the 5G C-band environment,” the FAA stated in a Feb. 23 declaration. “It likewise does not use to airports where 5G isn’t released.”
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