SAIB Focuses On B737 Horizontal Stabilizer De-Icing Procedures | Aero-News Network
Aero-News Network
RSS icon RSS feed
podcast icon MP3 podcast
Subscribe Aero-News e-mail Newsletter Subscribe

Airborne Unlimited -- Most Recent Daily Episodes

Episode Date

Airborne-Monday

Airborne-Tuesday

Airborne-Wednesday Airborne-Thursday

Airborne-Friday

Airborne On YouTube

Airborne-Unlimited-05.13.24

Airborne-NextGen-05.07.24

Airborne-Unlimited-05.08.24 Airborne-FlightTraining-05.09.24

Airborne-Unlimited-05.10.24

Thu, Aug 11, 2016

SAIB Focuses On B737 Horizontal Stabilizer De-Icing Procedures

Uncommanded Pitch-Up Event Reported On Approach

The FAA has issued a Special Airworthiness Information Bulletin (SAIB) concerning de-icing procedures of Boeing 737-600/-700/-700C/-800/-900/-900ER airplanes.

The SAIB was prompted a report from an operator of a Model 737-800 airplane of an uncommanded pitch-up event after intercepting the glide slope during a normal approach. The elevator failed to properly respond to autopilot commands, and the flight crew reported that the elevator responded only after higher column forces were applied.

It was determined that de-icing fluid can enter the tail cone during airplane de-icing with the horizontal stabilizer trimmed to the full leading-edge-up position. This fluid can then freeze around the elevator power control unit (PCU) input levers, restricting their movement. Boeing testing has shown that positioning the horizontal stabilizer in the green band range during de-icing will reduce the amount of fluid that can enter the tail cone through the elevator linkage side cutout.

Procedural changes have been made to the 737 Flight Crew Operations Manual (FCOM) D6-27370-TBC, dated September 25, 2014, and the Boeing 737-600/700/800/900 Aircraft Maintenance Manual (AMM), Task 12-33-01 “Cold Weather Maintenance Procedure,” dated October 15, 2014, to reduce the amount of fluid that can enter the tail cone through the elevator linkage side cutout. The revised FCOM procedure instructs the flight crew to position the horizontal stabilizer at the calculated take-off setting within the green band range for de-icing. The revised AMM procedure instructs maintenance personnel to position the horizontal stabilizer to five units of trim. Additional guidance for these procedures can be found in Boeing Fleet Team Digest 737NG-FTD-27-13005.

The FAA recommends that flight crews and maintenance technicians of the referenced airplanes follow the procedures outlined in the above service information.

(Image from file. Not incident airplane)

FMI: SAIB

Advertisement

More News

Bolen Gives Congress a Rare Thumbs-Up

Aviation Governance Secured...At Least For a While The National Business Aviation Association similarly applauded the passage of the FAA's recent reauthorization, contentedly recou>[...]

The SportPlane Resource Guide RETURNS!!!!

Emphasis On Growing The Future of Aviation Through Concentration on 'AFFORDABLE FLYERS' It's been a number of years since the Latest Edition of Jim Campbell's HUGE SportPlane Resou>[...]

Buying Sprees Continue: Textron eAviation Takes On Amazilia Aerospace

Amazilia Aerospace GmbH, Develops Digital Flight Control, Flight Guidance And Vehicle Management Systems Textron eAviation has acquired substantially all the assets of Amazilia Aer>[...]

Hawker 4000 Bizjets Gain Nav System, Data Link STC

Honeywell's Primus Brings New Tools and Niceties for Hawker Operators Hawker 4000 business jet operators have a new installation on the table, now that the FAA has granted an STC f>[...]

Echodyne Gets BVLOS Waiver for AiRanger Aircraft

Company Celebrates Niche-but-Important Advancement in Industry Standards Echodyne has announced full integration of its proprietary 'EchoFlight' radar into the e American Aerospace>[...]

blog comments powered by Disqus



Advertisement

Advertisement

Podcasts

Advertisement

© 2007 - 2024 Web Development & Design by Pauli Systems, LC