FAA Proposes Fix for Boeing's Tricky Thrust Reverser Sensor
Published Date: 3/30/2026
Proposed Rule
Summary
The FAA wants to make sure Boeing 737 planes keep flying safely by fixing a sensor that might wrongly say a thrust reverser is locked when it’s not. This means airlines will need to do some tests, measurements, and update their maintenance plans to catch any problems early. Comments on this plan are open until May 14, 2026, and these changes could mean some extra work and costs for operators but will keep passengers safer.
Analyzed Economic Effects
4 provisions identified: 2 benefits, 2 costs, 0 mixed.
Inspections and Maintenance Program Update
If you operate Boeing 737-600/700/700C/800/900/900ER airplanes, this proposed AD would require measurements, tests, operational checks, and a revision to your maintenance or inspection program to add certain certification maintenance requirements. The FAA estimates the inspection and checks cost $1,530 per airplane (18 work-hours × $85/hour) and estimates revising the maintenance program takes 90 work-hours per operator ($7,650).
Possible Part Replacements and Costs
If inspections find problems, operators may have to replace parts: an upper locking hydraulic actuator replacement is estimated at $47,920 per product, a torsion spring replacement at $104, and a proximity sensor target replacement up to $215. The FAA states it cannot predict how many aircraft will need these on-condition replacements.
Prevents False 'Locked' Indications
The proposed rule addresses a sensor/target adjustment issue that could make a thrust reverser show it is 'locked' when it is not, which could lead to an uncommanded in-flight deployment and loss of control. The AD would require checks and program changes to reduce that risk and keep passengers safer.
Terminates Prior Repetitive Test Requirement
For the affected Boeing 737 models, completing the actions required by this proposed AD would terminate the actuator integrity test and corrective actions that were required by AD 2019-18-03 (paragraphs (i), (j), and (k)). This would remove the need to continue those specific repetitive tests once you comply with this new AD.
Your PRIA Score
Personalized for You
How does this regulation affect your finances?
Sign up for a PRIA Policy Scan to see your personalized alignment score for this federal register document and every other regulation we track. We analyze your financial profile against policy provisions to show you exactly what matters to your wallet.
Key Dates
Department and Agencies
Related Federal Register Documents
2026-13440 — Enabling Supersonic Overland Flight
The FAA wants to let supersonic planes fly over land again by updating old rules that banned them because of loud sonic booms. Thanks to new tech that keeps booms quiet, this change will open the door for faster, cooler flights across the U.S., helping America lead the world in supersonic travel. People and companies interested in supersonic flight should share their thoughts by August 17, 2026.
2026-13126 — Designation-Restrict the Operation of Unmanned Aircraft in Close Proximity to a Fixed Site Facility; Extension of Comment Period
The FAA is giving more time—until August 5, 2026—for people to share their thoughts on new rules that would limit drone flights near important fixed sites like power plants or airports. This affects drone operators and facility owners who want to keep the skies safe and secure. No new costs yet, just extra time to weigh in and help shape the rules.
2026-08943 — Designation-Restrict the Operation of Unmanned Aircraft in Close Proximity to a Fixed Site Facility
The FAA is proposing new rules to keep drones away from certain important fixed sites like power plants or airports to keep everyone safe and secure. If you own or operate one of these sites, you can request a drone flight restriction zone to protect your property and people nearby. Comments are open until July 6, 2026, and these changes could affect drone pilots and site operators, but no big costs are expected.
2026-14248 — Establishment of Class E Airspace; Crown Point, IN
Starting October 29, 2026, the FAA is creating new Class E airspace around the Franciscan Health Crown Point Hospital Heliport in Crown Point, Indiana. This change helps pilots fly safely using instruments, especially in bad weather. If you fly helicopters or planes near this hospital, get ready for updated flight rules—no extra costs, just smoother skies!
2026-14205 — Amendment of Class D Airspace and Removal of Class E4 Airspace Over Nashua, NH
The FAA is updating the airspace rules over Nashua, NH by removing some unnecessary Class E airspace around Boire Field Airport and tweaking the Class D airspace wording to stay current. These changes take effect on October 29, 2026, and won’t cost anyone extra or cause delays. Pilots flying in and out of Nashua will notice clearer, simpler airspace rules that keep things safe and smooth.
2026-14281 — Airworthiness Directives; Rolls-Royce Deutschland Ltd & Co KG Engines
The FAA wants all Rolls-Royce Deutschland BR700-725A1-12 engines to follow new, stricter rules for checking and replacing parts that wear out over time. This means operators must update their maintenance plans to keep engines safe and sound. Comments on this proposal are open until August 31, 2026, so affected operators should act fast to avoid surprises and extra costs later.
Previous / Next Documents
Previous: 2026-06066 — Reporting Deadline Extension for the Health and Safety Data Reporting Rule Under Toxic Substance Control Act (TSCA) Section 8(d)
The EPA is giving chemical makers and petroleum refineries an extra year—until May 21, 2027—to submit health and safety data under a special reporting rule. This delay helps everyone catch their breath while the EPA rethinks the rule. No extra fees yet, just more time to get it right!
Next: 2026-06085 — Airworthiness Directives; Airbus SAS Airplanes
The FAA wants Airbus A350-941 planes to get a safety check because some landing gear parts might be missing or loose. Pilots and airlines will need to inspect and fix the brake rod parts soon to keep flights safe. Comments on this plan are open until May 14, 2026, and fixing these issues might cost some time and money but will keep everyone flying safely.