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conducted its participation in the industry’s voluntary AFSSP.
6.4.1 Objectives
Bombardier’s main objective was to verify current maintenance programs, maintenance practices,
design principles, and manufacturing processes by gathering data on the condition of in-service
fuel tanks. This data is being used to ensure the continuing airworthiness of the Bombardier fleet
by developing improvements as required to the aircraft maintenance program, and to help respond
constructively to any new rulemaking.
6.4.2 Inspection Program
In accordance with guidelines set out by the Fuel System Safety Leadership Team (FSSLT), the
inspections covered all fuel system aspects including wiring condition, general tank condition,
component condition, and bonding. The field data was obtained through Bombardier Service
Bulletin 601R-28-037 (CRJ) and Service Bulletin 8-28-31 rev B (Dash 8). The original plan was
ATA Fuel System Safety
Leadership Team
Bombardier Working Group
CRJ 100/200
Working Group
________________
Engineering
In-Service Engineering
Maint. Engineering
CRJ Inspection
Participants
________________
Air Canada
Lufthansa City Line
Comair
Air Littoral
Dash-Series
Working Group
________________
Engineering
In-Service Engineering
Maint. Engineering
Dash Inspection
Participants
________________
Air BC, Air Nova,
Canadian Regional,
Nav Canada,
Eastern Australia,
Flight West Airlines
Shorts
Working Group
________________
6.0 Bombardier Working Group Report (continued)
August 4, 2000 Industry AFFSP Report Page 57
to inspect 20 CRJ 100/200, 14 Dash 8, and 4 Dash 7 aircraft. Note that the CRJ 100 and 200 have
identical fuel systems; the CRJ 700 is not yet in service; the Dash 8-100, -200, and -300 series
have very similar fuel systems; and the Dash 8-400 entered service after the initiation of the
inspection program.
There were more than 110 electrical bonding measurements per aircraft in the CRJ service bulletin
and more than 124 in the Dash 8 service bulletin. Both service bulletins required a thorough visual
inspection of the entire fuel system. Inspections were intended to be conducted during regularly
scheduled aircraft C Check downtime or other scheduled tank-entry maintenance opportunities.
The inspection completion time for these service bulletins was 52 labor-hours for the CRJ and 60
labor-hours for the Dash 8.
Bombardier personnel provided on-site support for the first inspection performed with each
operator. BCD M-1 bonding meters, manufactured by BCD Electronics Ltd., were primarily used.
These meters can take readings from 0.01 milliohms up to 20 ohms.
To obtain data not covered by the service bulletins, two high-time CRJ electrical conduits were
removed; one fuel boost pump and one valve. The entire assemblies, with wires in conduits, were
inspected at the Bombardier Materials and Processes Laboratory.
In addition to data gathering in the field, aircraft- and component-level lightning research and
development testing is being conducted in association with Lightning Technologies, a lightning
specialist company. See section 6.7 for more information.
The following three tables summarize the Bombardier Working Group inspection program:
Airline Aircraft type operated Location
Lufthansa City Line CRJ Europe
Comair CRJ North America
Air Littoral CRJ Europe
Air Canada CRJ North America
Air Nova DHC-8 (Dash 8) North America
Air BC Dash 8 North America
Canadian Regional Dash 8 North America
Nav Canada Dash 8 North America
Eastern Australia Dash 8 Australia
Flight West Airlines Dash 8 Australia
Figure 6-2: Airline Inspection Participation
6.0 Bombardier Working Group Report (continued)
Page 58 Industry AFFSP Report August 4, 2000
Aircraft First
delivery Seats
Average
annual
hours
Average
annual
cycles
High-time
aircraft
(hours)
High-time
aircraft
(cycles)
CRJ 100 / 200 1993 50 2,444 2,183 17,855* 16,300*
DHC-8 (Dash 8) 1985 37 / 57 2,207 2,632 40,082** 54,301**
* As of April 2000
**As of June 2000 Figure 6-3: Fleet Data
Aircraft Inspected Minimum
hours
Maximum
hours
Average
hours
Minimum
cycles
Maximum
cycles
Average
cycles
CRJ 12 6,392.9 15,160 11,778.4 5,662 14,635 10,527
Dash 8 18 16,502 34,361 24,860 18,210 43,416 30,779
Figure 6-4: Aircraft Model Inspection Information
CRJ inspections included aircraft from North America and Europe. Dash 8 inspections included
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