75-14-01 MESSERSCHMITT BOELKOW BLOHM Gmbh.: Amendment 39-2245 as amended by Amendment 39-2277. Applies to Messerschmitt Boelkow Blohm (MBB) Model BO-105 helicopters certificated in all categories.
Compliance is required as indicated.
To prevent failure in service accomplish the following:
(a) Before further flight, remove flexible hose assemblies having any of the following MBB or ESPA part numbers that have blue fittings marked MS24590. Replace with flexible hose assemblies of the same MBB or ESPA part number that have silver or metal colored fittings marked 12 LN 29813.
MBB PART NUMBER
ESPA PART NUMBER
105 - 61795
40848 - 1290
105 - 61796
40561 - 1185
105 - 61797
40561 - 820
105 - 61798
40560 - 440
105 - 62163
40558 - 415
105 - 62165
40558 - 500
105 - 61793
40561 - 355
105 - 62161
40561 - 960
105 - 62162
40561 - 1010
105 - 62169
40848 - 820
105 - 62168
40848 - 775
105 - 61792
40562 -330 -0
105 - 61791
40562 - 1125
105 - 62166
40849 - 810
105 - 62167
40849 - 865
105 - 61799
40560 - 600
105 - 61343
40848 - 250
105 - 61344
40848 - 890
105 - 90897
40556 - 350
(Replaces 105-90898)
(b) Before further flight, except that the aircraft may be flown in accordance with FAR Sec.21.197 and 21.199 to a base where the work can be performed, remove flexible hose assemblies, MBB part numbers 105-61797, -61798, and -61799 that have the marking "HN-10" behind the part/drawing number or that have "ESPA HN-10" marked on the hose surface. Replace with serviceable assemblies of the same part number that do not carry the designation "HN-10" or "ESPA HN-10".
(c) Before further flight, except that the aircraft may be flown in accordance with FAR Sec. 21.197 and 21.199 to a base where the work can be performed, inspect flexible hose assemblies having the following part/drawing numbers that carry the designation "HN-10" or "ESPA HN-10",for cracks in the area where the hose extrudes from the fitting. Remove and replace in accordance with the following schedule:
105 - 61795
105 - 62162 (or D133 - 1580)
105 - 61793
105 - 62169 (or D133 - 1585)
105 - 61343 (or D133 - 1577)
105 - 61344 (or D133 - 1578)
(1) If cracks are found, or prior to reaching the hose assembly service life limit if no cracks are found, remove the assembly and replace with a serviceable assembly of the same part number that does not carry designation "HN-10" or "ESPA HN-10".
(2) If no cracks are found, the hose assembly may be continued in service until reaching the service life limit of 100 hours total time in service provided the assembly is reinspected at intervals not to exceed 25 hours time in service or two calendar weeks, whichever occurs first.
(Messerschmitt Boelkow Blohm BO-105 Alert Bulletins 10, 11, and 12 and Service Bulletin 60-14 cover this same subject.)
Amendment 39-2245 was effective upon publication in the Federal Register.
This Amendment is effective upon publication in the Federal Register as to all persons except those persons, to whom it was made immediately effective by the telegram dated June 25, 1975, which contained this amendment.