Bollettino di Servizio Service Bulletin

Bollettino di Servizio
Service Bulletin
No. 91
Date Nov. 30, 1993
Approvato dal R.A.I./R.A.I approved:
(94-75/TNA 11.01.1994)
Note:
Only engineering aspects are R.A.I approved. If inspection, modifications or
technical prescriptions and their relative times of compliance are compulsory
for the R.A.I., the sanction is in the relevant airworthiness directives.
Subject:
- STABILATOR TORQUE TUBE ATTACHMENT SHELVES
(P/N 5.3017-1/2)
- FLAP HINGE SHELVES (P/N 1.3041-3/4; 1.3043-2)
- AILERON HINGE SHELVES (P/N 1.3045-2; 1.3047-1/2)
Type:
Information
Recommended
Mandatory
only
Action
Action
A case of corroded shelves has been reported to us.
It is mandatory to check their surface treatment as per following instructions
(Part "A" and "B").
Models affected & S/N:
All P68 a/c series
Time of compliance:
At next 100 hours inspection
Weight and balance change:
//
Publications affected:
Maintenance Manual
Modification to be carried out by:
User
Page 1 of 4
PARTENAVIA
Service Bulletin N 91
Instructions:
Part "A" - Inspection of the stabilator torque tube attachment shelves (P/N 5.3017- 1/2)
1.
Remove tail cone.
2.
Visually check surface treatment (Alodine 1200) of stabilator torque tube attachment
shelves.
Note
Treated surfaces are easily idetifiable for their typical yellow colour.
3.
In case of treated surfaces, use the current Maintenance Schedule reported in the
Maintenance Manual and skip to 7 point of this part.
4.
In case of untreated surfaces, visually check shelves for corrosion.
5.
If corrosion is found, contact Partenavia for the necessary actions.
6.
If corrosion is not found, it is necessary to modify the current Maintenance schedule to
check the shelves for corrosion every 200 flight hours or 1 year whichever the first.
Note
Page 4 of 4 shows the flow-chart of the actions as per points 2 through 6.
7.
Reinstall tail cone and record the application of this Service Bulletin in the a/c Log-book.
Note
Convert the shelf surfaces with alodine 1200 (MIL-C-5541) at the next stabilator torque tube
removal. Said operation annuls the Maintenance schedule modification of point 6 to use the
current schedule of the Maintenance Manual.
Page 2 of 4
PARTENAVIA
Service Bulletin N 91
Instructions:
Part "B" - Inspection of the flap hinge shelves (P/N 1.3041-3/4; 1.3043-2)
- Inspection of the aileron hinge shelves (P/N 1.3045-5; 1.3047-1/2)
1.
To gain a better access to shelves, place flaps and ailerons downward.
Remove a small area of paint from the flap and aileron hinge shelves by using a proper
paint remover type ARDROX 2526 (Specif. MIL-R-81294 C) or equivalent.
Note
Paint remover has to be handled with care to prevent dropping in unaccessibile areas, then
producing corrosion.
2.
Visually check surface treatment (Alodine1200) of flap and aileron hinge shelves in the
stripped areas.
Note
Treated surfaces are easily identifiable for their typical yellow colour.
3.
In case of treated surfaces, use the current Maintenance schedule reported in the
Maintenance Manual and skip to point 7 of this part.
4.
In case of untreated surfaces, remove paint from all the surface and visually check
shelves for corrosion, carrying out an accurate inspection in proximity of wing
attachment.
5.
If corrosion is found, contact Partenavia for the necessary actions.
6.
If corrosion is not found, it is necessary to modify the current Maintenance schedule to
check shelves for corrosion every 200 flight hours or 1 year whichever the first.
Note
Page 4 of 4 shows the flow-chart of the actions as per points 2 through 6.
7.
Paint the stripped areas of shelves as previously painted and record the application of
this Service Bulletin in the a/c Log-book.
Page 3 of 4
PARTENAVIA
Service Bulletin N 91
Page 4 of 4