Aircraft
Certification Service Washington, DC U.S. Department of Transportation Federal Aviation Administration
NM-07-26
April 5, 2007
This is information only. Recommendations
aren’t mandatory.
Introduction
The Special Airworthiness Information Bulletin (SAIB) advises you,
owners and operators of the Bombardier Inc. Model CL 600-2B19
(CRJ-100/200/440) aircraft that operators have reported numerous
incidents of flap failures during cold weather operations. Water
ingress into flap system components with subsequent freezing appears to
be a significant factor. Bombardier has an on going engineering
investigation to address the root causes of this issue.
Background
In addition to fuel shortage and landing distance issues, there
could potentially be an obstacle clearance and climb performance issues.
While the root cause of the flap failures are being investigated,
Bombardier has issued an All Operator’s Message (AOM) 1047 dated March
12, 2007, (attached) in order to provide some mitigating operational
guidance for Flap failure scenarios. We have determined that an AD is
not warranted at this time.
Recommendations
We strongly recommend that CRJ operators are informed of the attached Bombardier AOM and review its content.