COMPLIANCE:
Part I: within 25 flight hours from receipt of this Bollettino and then every 25 flight hours after first compliance with PART I.
Part II: within five (5) flight hours or thirthy (30) days from the receipt of this Bollettino, whichever comes first.
DESCRIPTION: As a result of the first available information of the AW139 event in Brazil, while the investigation is ongoing and waiting for additional information/analysis, as a precautionary measure, this Bollettino prescribes inspection and quarantine of the tail rotor blades meeting the criteria reported in the above paragraph.
NOTE
If the number of landings applicable to each single blade is not known throughout the entire service life of the blade, the number of landings shall be calculated multiplying the blade flight hours by a factor of 4 (four).
Example:
0-150 FH: landings unknown
150-450 FH: accumulated landings 550, based on helicopter logbook
Total landings = 150*4 + 550 = 1150
Remaining landings = 1500 – 1150 = 350 landings
In the meantime collection of all necessary evidence is going on in order to isolate the root cause and determine the final corrective actions
Part II:
1. Prepare the helicopter for safe ground maintenance. Disconnect the battery and all the electrical power sources and/or the external power supply.
2. Get access to the tail rotor and remove the tail rotor blades P/N 3G6410A00131 or P/N 4G6410A00131 having logged more than 600 flying hours or more than 1500 landings whichever occurs first. Refer to AMP, see DM n° 39-A-64-11-01-00A-520AA or n° 39-B-64-11-01-00A-520A-A for the remove procedures.
3. Quarantine the removed tail rotor blades at step 2 in an appropriate segregated area, and contact Product Support Engineering (FOCSE.
[email protected]) for further instruction, providing the following details of the removed tail rotor blades: helicopter S/N and total time, tail rotor blade P/N, S/N and total time since new and landings.