Aircraft
Certification Service Washington, DC U.S. Department of Transportation Federal Aviation Administration
NM-20-03
March 18, 2020
This is information only. Recommendations
aren’t mandatory.
Introduction
This Special Airworthiness Information Bulletin (SAIB) advises
registered owners and operators, principal inspectors, and certificated
repair facilities of potential failure of certain landing gear brake
control valve (BCV) springs, manufactured by Tactair and installed on
Bombardier Inc. Model CL-600-2A12 (601) airplanes, which render the BCV
inoperable and cause a lack of braking capability upon landing.
At this time, the airworthiness concern is not an unsafe condition that
would warrant airworthiness directive (AD) action under Title 14 of the
Code of Federal Regulations (14 CFR) part 39.
Background
On March 1, 2015, a Bombardier Inc. Model CL-600-2A12 (601) airplane
experienced a landing overrun and subsequent collapse of the nose
landing gear at Marco Island Airport in Marco Island, Florida. It was
reported that upon landing, the pilot was unable to extend the ground
spoilers and then applied “moderate” braking, but felt no deceleration.
The pilot subsequently attempted to deploy the thrust reversers, but
was unable to do so. The two pilots, a flight attendant, and four of
the six passengers were not injured, and of the two remaining
passengers, one sustained a serious injury and one sustained minor
injuries. The airplane sustained substantial damage.
Investigation into the accident revealed that a broken left power BCV
spring in the airplane’s left inboard brake was a contributing factor
to the landing overrun. The broken spring caused the function of the
power BCV spring to fail, therefore, not transmitting load to the brake
controller assembly, rendering the BCV inoperable.
The BCV spring is part of a BCV manufactured by Tactair, having part
number (P/N) HP1333100-9 (Bombardier Inc., Canadair P/N 600-75115-9).
The BCV design incorporated a BCV spring with one dead coil on each
end; however, in September of 1990, a new spring design with three dead
coils on each end was incorporated, the change was controlled by
revision to the spring drawing only with no part number change.
As a result, the National Transportation Safety Board issued Final
Aviation Investigation Report ERA15LA140, dated November 28, 2017,
recommending the development of an SAIB to alert principal inspectors
and owners and operators of Bombardier Inc. Model CL-600-2A12 (601)
airplanes of the potential failure of BCV springs manufactured by
Tactair.
Recommendation
The FAA recommends that all owners and operators of the affected
airplanes review the actions outlined in page 12 of Bombardier Business
Aircraft Customer Forum & Newsletter, Volume 15, Issue 4, dated
February 21, 2018, for awareness of potential failure of certain
landing gear BCV springs, rendering the BCV inoperable and causing a
lack of braking capability upon landing.
For Further Information Contact
Darren Gassetto, Aerospace Engineer, New York ACO Branch, FAA, 1600
Stewart Avenue, Suite 410, Westbury, NY, 11590; phone: (516) 228-7323;
fax: (516) 794-5531; email: darren.gassetto@faa.gov.
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