AD 99-01-12

Applies to

Model EMB-145 series airplanes, serial numbers 145004 through 145047 inclusive and 145049 through 145051 inclusive; certificated in any category; equipped with IC-600 having part number (P/N) 7017000-82402 or P/N 7017000-83402; excluding those airplanes on which the modification specified in any of the following Embraer service bulletins has been accomplished: Embraer Service Bulletin 145-22-0001, dated May 7, 1998; Embraer Service Bulletin 145-22-0004, Revision 01, dated July 30, 1998; Embraer Service Bulletin 145-31-0007, Revision 02, dated June 30, 1998.

The FAA's summary

This document publishes in the Federal Register an amendment adopting airworthiness directive (AD) 99-01-12 that was sent previously to all known U.S. owners and operators of certain EMBRAER Model EMB-145 series airplanes by individual notices. This AD requires revisions to the Airplane Flight Manual to provide the flight crew with updated procedures for prohibiting use of the autopilot below 1,500 feet above ground level, emergency procedures for pitch trim runaway, and abnormal procedures for autopilot trim failure and stabilizer out of trim. This AD also requires installation of certain warning placards. This action is prompted by a report indicating that, during a flight test of a similar airplane model, the pitch trim monitoring subsystem malfunctioned internally. The actions specified by this AD are intended to prevent failure of the pitch trim system, which could cause undetected autopilot trim runaway, and consequent reduced controllability of the airplane, uncommanded autopilot disconnect, and excessive altitude loss.

Filed under

The aircraft, engines and makers this AD names, by the model designations in its text. A model listed here may still be outside the AD's serial ranges.

Official sources

• The Federal Register document · document 99-1980, the legal text
• FAA Dynamic Regulatory System (DRS) · search 99-01-12 for its current status and any corrections