SAIB NM-05-60 —

NM-05-60 June 17, 2005 http://www.faa.gov/aircraft/safety/alerts/ This is information only. Recommendations aren’t mandatory.

Introduction

This Special Airworthiness Information Bulletin (SAIB) advises you, owners and operators of Bombardier, Inc. model CL-600-2B19 (Regional Jet series 100 & 440) (CRJ 200) series airplanes, that Bombardier has published a revised Airplane Flight Manual (AFM) procedure for Mach Trim and Stab Trim, Temporary Revision (TR) RJ/152-2, dated June 10, 2005, (attached).

Background

Bombardier issued an All Operator Message (AOM) # 870 to provide advice to the aircrew and mitigate the risk of an in-flight event. They are continuing their investigation and have now issued RJ/152-2 to Airplane Flight Manual CSP A-012 that formalizes the subject matter from AOM 870. Recommendations

We strongly recommend that you review RJ/152-2 and insert this change into the CL-600-2B19 airplane flight manuals. We have determined that an AD isn’t warranted at this time.

For Further Information Contact

Dan Parrillo, Aerospace Engineer, FAA NYACO, ANE-172, 1600 Stewart Ave, Suite 410, Westbury, NY 11590; phone: (516) 228- 7305; fax: (516) 794-5531; email: [email protected]

TEMPORARY REVISION RJ/152–2 Jun 10/05 LETTER OF TRANSMITTAL REASON FOR ISSUE Temporary revision to advise the flight crew of the following:
Revised MACH TRIM and STAB TRIM procedure. <STAB TRIM procedure - Additional step to engage channel 2 independent of channel 1 in dual channel failure, add coverage for STAB TRIM DISC switch stuck in the depressed position, and coverage for the autopilot>. INSTRUCTIONS FOR INSERTION OF THIS TEMPORARY REVISION (1) Insert the Record of Temporary Revisions in the front portion of the Airplane Flight Manual. (2) Remove and destroy the pages and the Letter of Transmittal of Temporary Revision No. TR RJ/152-1. (3) Insert the pages of this Temporary Revision in the Airplane Flight Manual as instructed at the top of each page. (4) Record the insertion of this Temporary Revision on the Record of Temporary Revisions page. (5) Retain this page for record purposes. LIST OF PAGES AFFECTED BY THIS TEMPORARY REVISION
05-11-3. Page 1 of 3 Airplane Flight Manual CSP A-012 DOT Approved

TEMPORARY REVISION RJ/152–2 Jun 10/05 INSERT IN ABNORMAL PROCEDURES – FLIGHT CONTROLS FACING PAGE 05–11–3 ACTION 1 Change the paragraph “C. MACH TRIM” to read as follows: C. MACH TRIM With at least one STAB TRIM channel engaged: (1) MACH TRIM switch ENGAGE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . (2) STAB TRIM switch Actuate as required . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . to manually trim the airplane. NOTE With a Mach trim failure, do not exceed 250 KIAS (0.7 M) unless the autopilot is engaged and operating normally. ACTION 2 Change the paragraph “D. STAB TRIM” to read as follows: D. STAB TRIM Pending Rectification: (1) STAB TRIM DISC switches Press firmly, then release . . . . . . . . . . . . . . . . . . . . . . . . . . (2) STAB TRIM CH 1 and CH 2 switches ENGAGE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Pending Rectification: If STAB TRIM caution message persists: (3) STAB TRIM CH 2 switch ENGAGE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . If STAB TRIM caution message goes out: (3) MACH TRIM switch ENGAGE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . If STAB TRIM caution message still persists: NOTE 1. Minimize changes to airspeed and configuration to minimize control forces or autopilot servo loads. 2. Disregard MACH TRIM caution message. If autopilot engaged: (4) Leave engaged to reduce the workload. Page 2 of 3 Airplane Flight Manual CSP A-012 DOT Approved

TEMPORARY REVISION RJ/152–2 Jun 10/05 D. STAB TRIM (CONT'D) If AP TRIM ND (NU) caution message is displayed: (5) Airspeed Adjust as required . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . to keep autopilot engaged as long as possible.
AP TRIM ND is displayed Decrease airspeed . . . . . . . . . . . . . . .
AP TRIM NU is displayed Increase airspeed . . . . . . . . . . . . . . . NOTE AP TRIM ND (NU) caution message will go out if the airspeed is adjusted. If AP TRIM ND (NU) caution message persists: NOTE Anticipate an outoftrim condition with autopilot disengagement. (6) Autopilot Disconnect . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . (7) Proceed to Prior to Landing". If AP TRIM ND (NU) caution message goes out: (5) Proceed to Prior to Landing". If autopilot disengaged: (4) Proceed as Prior to Landing". Prior to landing: If failure occurred at flaps 0, 8, 20 or 30: Airplanes with the GPWS installed: (5) GPWS/FLAP OVRD switch OVRD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Airplanes with the EGPWS <0040> installed: (5) GRND PROX, FLAP switch OVRD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . (6) Landing flaps 20 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . (7) Approach speed VREF (Flaps 45°)+12 KIAS minimum . . . . . . . . . . . . . . . . . . . . . . . . . . (8) Actual landing distance Increase . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . WITHOUT THRUST REVERSERS WITH THRUST REVERSERS 1.25 (25%) 1.22 (22%) If failure occurred at flaps 45: (5) Landing flaps Leave at 45 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 3 of 3 Airplane Flight Manual CSP A-012 DOT Approved