CHAPTER 20
PAGE 4
PAGE DATE: 1. March 2011
MAINTENANCE MANUAL EXTRA 330LX
Metric thread size
(08 = M8 = 8 mm/0.31 inch)
and Length
(042 = 42 mm/1.65 inch)
Bolt Head Identification
Bolt Head:
LN Specification
Letter (R,L,P,H = Identification of
Manufacturer)
20-10-00 STANDARD PRACTICES AIRFRAME
20-10-01 Type of Bolts
For the EXTRA 330LX, LN-bolts (LN="Luftfahrt Norm"),
AN-bolts (AN="Army/Navy") and DIN-bolts
(DIN="Deutsche Industrie Norm") are used. The type of bolt
can be identified by the designation on the bolt head and by
the surface treatment.
LN-Bolts
Hex head LN 9037, LN 9038 K and LN 9355 aircraft bolts
are made of high-strength type 1.7220.5 alloy steel. The
bolts are centerless ground, threaded after heat treatment
and cadmium plated per specification LN 9368-3000.2.
Bolts according LN 9037 are standard aircraft bolts with
undrilled shank. The specification LN 9355 indicates bolts
with shanks drilled for cotter pins. The specification LN
9038 K indicates bolts with drilled head for safety wire and
a shank up to the head.
The added numbers after the dash of bolt spec. indicates the
dimensions of the bolt. These numbers are not marked on the
head of the LN bolt. Measure the diameter and length to
specify the type dimension of the LN bolt. The length of a LN
aircraft bolt is measured from under the head to the end of
the shank.
Example: LN 9037-08042
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