FAA issues Airworthiness Directive on cracks in pickle forks on Boeing 737NG aircraft
Last Update: October 10, 2019 / 19:14:26 GMT/Zulu time
Date of incident
Oct 3, 2019
The FAA reports: "In September 2019, the FAA received reports of cracking discovered in the left and right hand side outboard chords of the station (STA) 663.75 frame fittings and failsafe straps adjacent to the stringer S-18A straps on multiple Boeing Model 737-800 airplanes during a passenger-to-freighter conversion. The affected airplanes had accumulated between 35,578 and 37,329 total flight cycles. Cracking in the STA 663.75 frame fitting outboard chords and failsafe straps adjacent to the stringer S-18A straps, if not addressed, could result in failure of a Principal Structural Element (PSE) to sustain limit load. This condition could adversely affect the structural integrity of the airplane and result in loss of control of the airplane."
The FAA stated: "This AD requires repetitive inspections for cracking of the left and right hand side outboard chords of the STA 663.75 frame fittings and failsafe straps adjacent to the stringer S-18A straps. This AD also requires repair of all cracking using a method approved by the FAA or The Boeing Company Organization Designation Authorization (ODA). This AD also requires sending a report of all results of the initial inspection to Boeing."
The AD is currently considered interim action.
On Oct 10th 2019 Southwest Airlines (USA) reported they found cracks in the pickle forks of two of their aircraft and grounded them, Gol Transporter Aereos (Brazil) reported they found cracks in the pickle forks of 11 of their aircraft.
On Oct 10th 2019 Boeing reported 810 jets have been inspected so far, of them 38 were found with cracks in the pickle forks requiring repair.
Boeing's patent US9399508B2 explains the function of the pickle forks, so called because of their shape.
Date of incident
Oct 3, 2019
This article is published under license from Avherald.com. © of text by Avherald.com.
Read unlimited articles and receive our daily update briefing. Gain better insights into what is happening in commercial aviation safety.
Support AeroInside by sending a small tip amount.
A UPS United Parcel Service McDonnell Douglas MD-11 freighter, registration N270UP performing flight 5X-2111 from New York JFK,NY to Louisville,KY…
An Austrian Airlines Airbus A320-200, registration OE-LXE performing flight OS-794 from Sofia (Bulgaria) to Vienna (Austria), was lining up Sofia's…
Are you researching aviation incidents? Get access to AeroInside Insights, unlimited read access and receive the daily newsletter.Pick your plan and subscribe
A new way to document and demonstrate airworthiness compliance and aircraft value. Find out more.
ELITE Simulation Solutions is a leading global provider of Flight Simulation Training Devices, IFR training software as well as flight controls and related services. Find out more.
Your regulation partner, specialists in aviation safety and compliance; providing training, auditing, and consultancy services. Find out more.
Popular aircraftAirbus A320
Boeing 737-800 MAX
Popular airlinesAmerican Airlines