Tue, Nov 16, 2021
AD 2021-18-17 Adds A New Requirement To Update The Version Of The FCC OPS If Necessary
The FAA is superseding Airworthiness Directive (AD) 2012-21-08, which applied to certain The Boeing Company Model 737-600, -700, -700C, -800, and -900 series airplanes.
AD 2012-21-08 required inspecting for part numbers of the operational program software (OPS) of the flight control computers (FCCs) and installing and testing an updated version of the FCC OPS. This AD was prompted by reports that during autopilot coupled instrument landing system (ILS) approaches, the airplane did not capture or track the glideslope correctly. This AD retains the requirement to inspect for part numbers of the OPS of the FCCs, and adds a new requirement to update the version of the FCC OPS if necessary. This AD also expands the applicability to include The Boeing Company Model 737-900ER series airplanes. The FAA is issuing this AD to address the unsafe condition on these products. This AD is effective December 20, 2021.
Supplementary Information: The FAA issued a notice of proposed rulemaking (NPRM) to amend 14 CFR part 39 to supersede AD 2012-21-08, Amendment 39-17224 (77 FR 64711, October 23, 2012) (AD 2012-21-08). AD 2012-21-08 applied to certain The Boeing Company Model 737-600, -700, -700C, -800, and -900 series airplanes. The NPRM published in the Federal Register on February 27, 2020 (85 FR 11319). The NPRM was prompted by reports that during autopilot coupled ILS approaches, the airplane did not capture or track the glideslope correctly. In the NPRM, the FAA proposed to continue to require inspecting for part numbers of the OPS of the FCCs, and to add a new requirement to update the version of the FCC OPS if necessary. The NPRM also proposed to expand the applicability to include The Boeing Company Model 737-900ER series airplanes. The FAA is issuing this AD to address the glideslope capture problem, which could allow the airplane to descend below the glideslope beam and result in controlled flight into
terrain on airplanes that do not have the upgraded FCC OPS installed.
More News
Aero Linx: Commercial Aviation Safety Team (CAST) Founded in 1997, the Commercial Aviation Safety Team (USCAST) has developed an integrated, data-driven strategy to reduce the comm>[...]
Land And Hold Short Operations Operations that include simultaneous takeoffs and landings and/or simultaneous landings when a landing aircraft is able and is instructed by the cont>[...]
We're Everywhere... Thanks To You! Even with the vast resources and incredibly far-reaching scope of the Aero-News Network, every now and then a story that should be reported on sl>[...]
Pilot’s Inadvertent Use Of The Landing Gear Control Handle Instead Of The Flaps Selector Switch During The Landing Rollout Analysis: The pilot reported that during the landin>[...]
Also: Cosmonaut Kicked Out, Airbus Scales Back, AF Silver Star, Russian A-60 Clobbered A Samaritan’s Purse humanitarian flight was hijacked on Tuesday, December 2, while atte>[...]
ANN's Daily Aero-Linx (12.12.25)
See All