Sun, Nov 06, 2005
AD Number: AD/BELL 412/45
Emergency Floatation Reservoir Adapter 13/2005 TX
Applicability: Bell Helicopter Textron Model 412
and 412EP helicopters, modified with Aeronautical Accessories, Inc.
(AAI), Supplemental Type Certificate (STC) SH2820SO; or with AAI
Parts Manufacturer Approval (PMA) reservoir assembly, part number
(P/N) 212-372-050; or with adapter, P/N 212-371-002,
Requirement: 1. Vent the nitrogen from the
reservoir assembly by following the Accomplishment Instructions,
Part II - Floatation System Discharging, of AAI Alert Service
Bulletin (ASB) No. AA-05005, Revision A dated 27 June 27 2005 or
later FAA Approved revision.
2. Remove the valve assembly and air line from the adapter, and
inspect the counter bore depth (dimension D) as shown in Figure 1
of the ASB.
(a) If dimension D, as depicted in Figure 1 of the ASB, does not
exceed .860 inch, recharge the floatation system by following the
Accomplishment Instructions, Part III - Floatation System Charging,
and referring to Figures 2 and 3 of the ASB.
(b) If dimension D, as depicted in Figure 1 of the ASB, exceeds
.860 inch, replace the reservoir assembly and the adapter with
3. Discharging and recharging the floatation system and inspecting
the counter bore depth dimension of the adapter shall be done in
accordance with the specified portions of the ASB.
Note: FAA AD 2005-20-38 Amendment 39-14335
Compliance: 1. Within the next 24 hours
time-in-service (TIS) or before the next emergency floatation
supply bottle nitrogen charging after the effective date of this
2. Within the next 24 hours time-in-service (TIS) or before the
next emergency floatation supply bottle nitrogen charging after the
effective date of this AD.
2. (b) Before further flight after the effective date of this
3. From the effective date of this AD.
This Airworthiness Directive becomes effective on 9 November
Background: The actions detailed in this AD are
intended to prevent rupture of an adapter, uncontrolled jetting of
pressurized gas from the nitrogen bottle, and subsequent injury to
occupants or damage to the helicopter.
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