Technical information

12
page
680, ATA: 27-40
500, 525, 550, S550 and 560, ATA: 35-00
Cessna Issues SLs
for Oxygen Bottle
Cessna has issued informational service letters instructing operators to make sure the hydrostatic test date is
current for DOT-3HT-1850 rated oxygen bottles. (This includes portable oxygen bottles also.) The cause for the SLs
is due to an error noted in several maintenance manuals, which incorrectly extended the hydrostatic test interval of
the bottles to five years. The correct hydrostatic test interval is three years.
The service letters SL500-35-06, SL525-35-05, SL550-35-08, SLS550-35-03, SL560-35-06 affect aircraft serials
500-0001 thru -0689, 525-0001 thru -0701, 550-0002 thru -1136, S550-0001 thru -0160, 560-0001 thru -0813.
Operators are instructed to inspect and verify the DOT rating of the oxygen bottle, followed by making sure the
hydrostatic test date is current, and the maintenance records correctly reflect the three-year inspection interval.
Questions, please contact:
Customer Service Hot Line
1-800-835-4090
316-517-6261 (International)
[e-mail]