69-20-03 GRUMMAN: Amdt. 39-848, as amended by Amdt. 39-924, applies to all G-159 aircraft.
Compliance required within the next 50 hours' time in service after the effective date of this airworthiness directive as amended. To prevent fuel filter blockage due to ice and possible engine flameout, accomplish the following or an equivalent approved by the Chief, Engineering and Manufacturing Branch, Southern Region.
(a) Install a fuel temperature indicator on each engine fuel system in accordance with Grumman Gulfstream Service Change 114, with Amendment 1 or later approved revision.
(b) Mark gage with red radial lines at +5 degrees C and +54 degrees C and a green arc from +5 degrees C to +54 degrees C.
(c) Install a placard adjacent to fuel temperature indicator which reads as follows: "Caution See AFM for use of fuel filter heater."
The use of a fuel additive as outlined in Advisory Circular 20-29A along with an appropriate Airplane Flight Manual supplement or Revision 21 to the G-159 Airplane Flight Manual is considered an equivalent means for showing compliance with paragraphs (a), (b), and (c).
Amendment 39-848 effective October 5, 1969.
This amendment (39-924) becomes effective January 23, 1970.