AD 67-11-01

67-11-01 COLONIAL AERONAUTICS (LAKE): Amdt. 39-381 as revised by Amdt. 39-459. Applies to models Colonial C-1 S/N 1 through 14, 16 through 20, 22 through 25; Colonial C-2 S/N 115, 126 through 143; Lake LA-4P S/N 121; Lake LA-4A S/N 244 and 245; Lake LA-4 S/N 246 through 356.

Compliance required within 25 hours' time in service after April 5, 1967, the original effective date of this AD, unless already accomplished.

To preclude unrestricted fuel from entering the cabin compartment in the event of failure of the fuel pressure gauge instrument line, accomplish the following:

Colonial C-2 and LA-4 Series - Braze a 3/16" diameter x 3/8" aluminum alloy rod into the 9 o'clock position of the "T" end of AN 824-4D fitting. Drill through rod with a #60 drill (0.40 in.). If previously accomplished using a 5/32" diameter rod, this is satisfactory.

Install the "T" assembly in the fuel pressure gauge instrument line just above the top of the hull (firewall) with the orifice end in the 6 o'clock position. Cap the open end (9 o'clock position) using an AN929-D4 cap.

NOTE: If the airplane is equipped with a fuel combustion heater, the AN 824-4D fitting already provided may be utilized and reworked per above.

Colonial C-1 - Remove the AN 894D6-4 reducer in the aft end of the fuel gauge instrument line and tap a 3/16-24NF thread 3/8" deep in the male end. Insert a threaded 3/16" aluminum rod utilizing "Loctite" sealant. Drill through rod with a #60 drill. This procedure may also be applied to the C-2 and LA-4 model aircraft.

Lake Aircraft Division, Consolidated Aeronautics Service Letters Nos. 14, dated February 24, 1967, and 14A, dated May 5, 1967, pertain to this request. Their P/N's 2-6700-153 and 1-6700-99 are the equivalent "T" and reducer assembly respectively.

This amendment effective August 5, 1967.

Revised August 5, 1967.