DOCUMENT 1136
REV. G
Instruction Manual
Pro APF Series LED
ICAO TCL, IHP, & STP
6
8.4 Metric Installation Bolt Torque and Method
The following recommendations apply to the M10 bolts used to mount a light unit (fixture) into a base can.
•
Use fully threaded A4-70P M10 x 1.5 bolts (P/N 21738 is recommended)
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Use Heico-lock or Nord-lock stainless steel-lock-washers per FAA specifications*.
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Mounting base holes must be degreased, cleaned, and dried prior to bolt installation.
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Base-to-fixture mating surfaces must be degreased, cleaned, and dried prior to installation.
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Apply marine grade anti-seize (K=.18) per manufacturer’s guidelines.
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Install the M10 bolts with lock-washers per lock-washer manufacturer’s guidelines.
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See section 7.3 for Heico-Lock installation guidelines (2014).
•
Achieve a full final torque of 26.8 N-m (237 in-lb) +10%, -0% with a calibrated torque wrench.
•
Impact wrenches are
not
recommended as installation tools.
•
Check torque/re-torque all bolts within 2 weeks of initial installation.
•
Maintain all bolts by checking torque and re-torqueing per FAA specifications*.
•
If other lubricants or thread locking compounds are used (not recommended), torque must be recalculated
based on K factor provided by lubricant or compound manufacturer.
•
New bolts and lock washers shall be used each time a light unit is removed from its base.
*Refer to the following specifications for FAA installation and maintenance recommendations:
•
AC150/5340-26
•
AC150/5345-46
•
FAA Engineering Brief No. 83A “
In-pavement Light Fixture Bolts
”
WARNING:
WARNING
ICAO ProAPF optical assemblies are designed to withstand a maximum torque of
40 N-m (353 in-lb) per bolt, assuming K=.18 lubricant and appropriate superior-
grade M10 hardware, however other components within the light fixture
installation (i.e. base-can, extension rings, spacer rings, etc.) may not be capable of
supporting such a load. Crouse-Hinds recommends following the installation bolt
torque values and methodology outlined in section 8.4.