IO-390-D Series Engine Maintenance Manual
05-50
© 2020 Avco Corporation. All Rights Reserved
Page 60
March 2020
IO-390-D Series Engine Maintenance Manual
Engine Inspection Checklist After Propeller Strike for IO-390-D Series Engines (Cont.)
Sequential Task
Additional Information
Corrective Action
Done/Comments
CAUTION
BASED UPON THE ACCUMULATED ENGINEERING, TECHNICAL, AND
HISTORICAL
DATA
AVAILABLE,
LYCOMING
ENGINES
PROHIBITS
STRAIGHTENING OR GRINDING OF BENT CRANKSHAFT PROPELLER FLANGES
TO RESTORE MAXIMUM RUN-OUT SPECIFICATION. IF THE CRANKSHAFT
PROPELLER FLANGE IS BENT, REPLACE THE CRANKSHAFT. DO NOT TRY TO
STRAIGHTEN OR GRIND THE CRANKSHAFT PROPELLER FLANGE. REFER TO
THE LATEST REVISION OF SERVICE BULLETIN NO. SB-201.
CRANKSHAFT P/N:
S/N:
14. Measure the flange run-out on the
crankshaft.
Refer to the latest revisions of both Service
Bulletin SB-240 and Part I of the
Service
Table of Limits - SSP-1776
for crankshaft
flange run-out tolerance.
Record the crankshaft flange run-out
measurement.*
Flange run-out
within acceptable
limits - use
crankshaft
Replace crankshaft
15. Measure the main bearing run-out
on the crankshaft.
Refer to the latest revision of Part I of the
Service Table of Limits - SSP-1776
for the
main bearing run-out tolerance
Record the main bearing run-out
measurement.*
Main bearing run-
out within
acceptable limits -
use crankshaft
Replace crankshaft
16. Measure the polished dimensions
on the main journals.
Refer to the latest revision of Part I of the
Service Table of Limits - SSP-1776
for the
dimensions on the main journals
Record the dimensions of the main
journals.*
Main journals
within acceptable
limits -
use crankshaft
Replace crankshaft
17. Measure the polished dimensions
on the pin journals.
Refer to the latest revision of Part I of the
Service Table of Limits - SSP-1776
for the
dimensions on the pin journals
Record the dimensions of the pin journals.*
Dimension:_________________________
Pin journals within
acceptable limits -
use crankshaft
Replace crankshaft
* If the measurement or dimension is out of tolerance, discard the crankshaft and replace it with a
serviceable crankshaft. Install the crankshaft per “Crankshaft Installation” procedure in Chapter 72-20.
