Airworthiness directives › 2020-12-15
AD 2020-12-15 Airworthiness Directives; Bombardier, Inc., Airplanes
Models named: BD-700-1A10, BD-700-1A11. Read the applicability below — it usually turns on serial or part numbers too.
Applicability*9
This AD applies to Bombardier, Inc., Model BD-700-1A10 and BD-700-1A11 airplanes, certificated in any category, serial numbers 9810 through 9838 inclusive, 9840 through 9842 inclusive, 9844 through 9846 inclusive, 9854 and 9855.
Compliance
Comply with this AD within the compliance times specified, unless already done.
Required actions
Before August 31, 2020, measure the trunnion nut torque of the V-band clamps at the left-and right-hand sides of the cabin pressure control system safety valves, in accordance with paragraphs 2.B.(1) and 2.B.(2) of the Accomplishment Instructions of the applicable service information specified in figure 1 to paragraphs (g) and (h) of this AD. ER09JY20.019
Unsafe condition
This AD was prompted by a report that certain safety valves at the left- and right-hand sides of the cabin pressure control system were not installed correctly and that the trunnion nuts used to fasten the V-band clamp were over torqued. The FAA is issuing this AD to address incorrect installation of the safety valves and over-torqued trunnion nuts, which could cause damage to the safety valve flange and could result in pressure leakage or cabin depressurization at altitude.
Affected ADs
None.
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The directive text above is reproduced from the Federal Register, a work of the United States government and in the public domain. The separation into applicability, compliance and required actions is TrackAD's.*1