AD/CL-600/65 Control Column Microphone Jack Modification
- FAA STC SA4900SW 8/2005 TX
Applicability: Model CL-600-1A11 (CL-600),
CL-600-2A12 (CL-601) and CL-600-2B16 (CL-601-3A, CL-601-3R, and CL-
604) aeroplanes; modified by United States federal Aviation
Administration (FAA) Supplemental Type Certificate (STC) SA4900SW,
excluding serial number 3025 and including, but not limited to, the
following serial numbers:
Model CL-600-1A11 (CL-600)
CL-600-2A12 (CL-601)
CL-600-2B16 (CL-601-3A, CL-601-3R and CL-604)
Serial Numbers
1054, 1059, 1069, 1071, 1080
3012, 3013, 3034, 3045, 3050, 3051, 3061, 3065
5012, 5046, 5060
Requirement: 1. Revise the Limitations and
Normal Procedures section of the Aircraft Flight manual (AFM) to
contain the following information: "Before every flight, perform a
visual check of the microphone jack assembly on the pilot's and
co-pilot's control column to detect damage that may interfere with
movement of the control column, including downward bending of the
receptacle. This check must be performed by the flight crew. Any
damage that may interfere with the movement of the control column
must be repaired before further flight."
Revision of the AFM may be accomplished by inserting a copy of
this Directive in the AFM. Note 1: Bombardier Advisory Wire
AW600-00-2247, Revision 2, dated March 24, 2005, provides
additional information on damaged microphone jack assemblies and
interference of damaged assemblies with movement of the control
column.
2. Modify the microphone jack assembly and perform all related
investigative actions and applicable corrective actions, in
accordance with the Accomplishment Instructions of Raytheon Service
Bulletin SB 23-3727, dated May 2005, except as provided by
Requirement 3. Once this modification is complete, the AFM revision
required by Requirement 1 may be removed from the AFM.
3. If any cracking is found during any inspection required by
this Directive or if the distance between existing and new fastener
holes is less than the limit specified in Raytheon Service Bulletin
SB 23-3727, dated May 2005, repair the cracking or carry out any
other applicable corrective action. Note 2: Contact Raytheon
Aircraft Company Arkansas Technical Support in accordance with SB
23-3727 for advice regarding repair or corrective action. Note 3:
FAA AD 2005-11-04 Amdt 39-14106 refers.
Compliance: For Requirement 1 - Within five
days after the effective date of this Directive. For Requirement 2:
a. If damage that may interfere with the movement of the control
column is found during any visual check performed in accordance
with the AFM revision - Before further flight. b. If damage that
may interfere with the movement of the control column is not found
during any visual check performed in accordance with the AFM
revision - Within 15 days or 15 hours time in service after the
effective date of this Directive, whichever occurs first. For
Requirement 3 - Before further flight immediately following
discovery of the anomaly.
This Airworthiness Directive becomes effective on 16 June
2005.
Background: This Directive is issued to prevent
a damaged microphone jack assembly from interfering with movement
of the control column, which could result in loss of control of the
aeroplane.
The FAA has received a report indicating that a Model
CL-600-1A11 (CL-600) aeroplane experienced a rejected take-off and
subsequently overran the runway. The nose landing gear collapsed,
and the forward fuselage was damaged as a result of the incident.
The flight crew reported that, when they attempted to take off, the
control column would not move aft beyond the neutral position.
Investigation revealed that the microphone jack assembly installed
on the co-pilot's control column was bent downward, which
restricted the aft movement of the control column.
The microphone jack assembly on the affected aeroplane was
installed incidental to STC SA4900SW. Therefore, all Bombardier
Model CL-600-1A11 (CL-600), CL-600-2A12 (CL-601), and CL-600-2B16
(CL-601-3A, CL-601-3R and CL-604) aeroplanes modified by that STC
may be subject to the same unsafe condition.