Canadian Aviation Service Difficulty Reports - Transports Canada

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222
Issue 4/2005
BOMBARDIER CL600-2B19 (RJ100) SDR # 20051012006
Auto-throttle Cable Severed
When both engines were removed for inspection access during a
heavy maintenance visit, the left engine auto-throttle retard cable
was found severed. (Canadair IPC, Chapter 76-10-00, Figure 2,
Item 220).
The cable was cleanly severed between the drilled jam nut
(Item 125), and nut (Item 165), just aft of the bellcrank (Item 85).
If the throttle lever(s) in the cockpit are beyond the idle position
and there is accidental thrust reverser deployment, then the
severed cable would have been unable to mechanically pull the
throttle lever(s) back to the idle position.
In this case, an astute technician found this defective cable. The
OEM is currently investigating the cause of the cable breakage.
The SDR database contains another similar event of a severed
auto-throttle retard cable.
CESSNA 441 SDR # 20050712011
Wiring Harness Chafed
The aircraft had experienced intermittent engine start problems
that were elusive to detect. Expert maintenance troubleshooting
finally resulted in finding two (2) ignition wires that had crossed
and then chafed together.
The only evidence of electrical shorting was a faint black dust at
the electrical connection.
When wrapping and clamping wire bundles ensure that chafing will
not occur.
CESSNA 650 SDR # 20050714001
Flap Flex Shaft Retainer Missing
Retainer Missing
While performing a visual
inspection, the right flap flex shaft
retainer was discovered to be
missing and possibly broken off.
These retainers are sometimes
difficult to inspect as they are
often covered with dirt or grease.
AMEs are reminded to take the
time to inspect for these devices
that are installed on many
different aircraft.
Retainer Installed