pressure reading is below the red band on the gage.
Page 1-5. Paragraph 1-6 is superseded as follows:
Paragraph 2-4e (3) is added as follows:
1-6. Differences in Models. The differences in model
(3) For Model V-1520-ANZ filter-separator, check
between the Model 844-5-V-100AL and Model
differential pressure gage periodically to be sure the
V-1520-ANZ filter-separators are the Model
pressure reading is below the red band on the gage.
844-5-V-100AL has a pop-up-type fuel pressure
Page 3-2, table 3-1. Item 3 is changed to read as
indicator and the Model V-1520-ANZ filter-separator
follows: "Differential pressure indicator (gage)"; add
has an indicating-type gage.
to column 4: "For Model V-1520-ANZ, check that the
Paragraph 1-7b (1.1) is added as follows:
reading is below red band on gage face."
(1.1) Identification
Page 4-1. Paragraph 4-1d is added as follows:
Manufacturer . . . . . . . . . . . . . Velcon Filters. Inc.
d. Inspect differential pressure indicator (gage) for
Model Number . . . . . . . . . . . . V-1520-ANZ
damage, loose mounting, broken glass.
Federal Stock No. . . . . . . . . . . 4330-491-4957
Paragraph 4-2g. Add the following "Make sure
Contract No . . . . . . . . . . . DSA 700-72-C-9687
Specification No . . . . . . . . . . .52556C
paint has been removed from frame at point ground
Paragraph 1-7b (5.1) is added as follows:
wire clamp is to be placed before attaching ground
wire clamp to frame."
(5.1) Differential pressure indicator (Model V-1520-ANZ).
Part Number . . . . . . . . . . . . . .1201-PG-1
Page 4-5, table 4-2. Item 1, add to "Malfunction"
Manufacturer . . . . . . . . . . . . . Orange Research Inc.
column: "YELLOW BAND READING ON DIFFE-
Federal Stock No. . . . . . . . . . None assigned
RENTIAL PRESSURE GAGE (MODEL
Page 2-1. In the warning for section I, line 6, add:
V-1520-ANZ)".
"Make sure paint has been removed from frame at
Item 2, add to "Malfunction" column: "RED
point ground wire clamp is to be placed before
BAND READING ON DIFFERENTIAL GAGE
installing ground wire clamp to frame."
(MODEL V-1520-ANZ)".
Paragraph 2-2a (3). In line 1, "slightly" is changed
In Step 3, add "(gage)" after "pressure indicator".
to read "slowly".
Paragraph 4-12d (1). In line 2, add "or equivalent"
Paragraph 2-2a (6) is superseded as follows:
after "MIL-S-7916".
(6) Once each day, open the air vent valve (5, fig.
Page 4-6, paragraph 4-13b. Add a new sentence as
1-2) slowly during operation to release entrapped air
follows: "For Model V-1520-ANZ filter-separators,
from the filter-separator. When all entrapped air has
when the pressure differential equals or exceeds 20
escaped, a small amount of fuel will come out of the
p.s.i., the readings are in the yellow band range on
valve. To open the vent valve, push DOWN and
the gage. When the pressure differential equals or
TURN until the wing is under the holddown. To
exceeds 35 p.s.i., the readings are in the red band
close, reverse the procedure.
range on the gage."
Paragraph 2-2b (3). In line 3, after "pressure
Paragraph 4-15a (4) is added as follows:
indicator, add "(gage)" before reference (6, fig. 1-2).
(4) Velcon Model V-1520-ANZ filter-separator
Paragraph 2-2b (5). Add a new sentence as follows:
gage.
"Change filter elements (para 3-5) immediately if the
(a) Disconnect the tube assembly coupling
differential pressure gage readings (Model
nuts from elbows (3, fig. 4-3).
V-1520-ANZ filter-separator) are in any portion of
(b) Remove screws (4) and remove pressure
the red band."
gage.
Page 2-2. Paragraph 2-4a (3) is added as follows:
(c) Place gage in padded vise (do not clamp too
(3) For Model V-1520-ANZ filter-separators,
tight) and remove the intake connector (8) from the
check the pressure differential gage periodically to
gage carefully. Remove piston (9) and spring (10).
be sure the pressure reading is below the red band on
(d) Remove outlet connector (8).
the gage.
(e) Clean all residue from the piston, spring,
Paragraph 2-4b (5) is added as follows:
and fuel passages in the gage with clean fuel or
(5) For Model V-1520-ANZ filter-separators,
cleaning solvent, using a lint-free cloth.
check differential pressure gage periodically to be
CAUTION
sure the pressure reading is below the red band on
Do not submerge gage in cleaning solution.
the gage.
Do not use abrasives to clean residue from
Paragraph 2-4c (4) is added as follows:
components.
(4) For Model V-1520-ANZ filter-separator, check
WARNING
differential pressure gage periodically to be sure the
pressure reading is below the red band on the gage.
Cleaning solvent, P-D-680, used for clean-
Paragraph 2-4d (3) is added as follows:
ing, is potentially dangerous chemical. Do
(3) For Model V-1520-ANZ filter-separator, check
not use near open flame.
differential pressure gage periodically to be sure the
Page 4-7. Figure 4-3 is added as follows:
4
