T.O. 33B-1-1
1-25
g. Parts not free of residual penetrant (lipophilic process) are completely cleaned and reprocessed through
penetrant and emulsifier.
1.5.2.10
Drying.
NOTE
Depots with automated and semi-automated penetrant inspection systems may
exceed the 140°F (60°C) drying oven temperature while performing inspections
with these systems. The temperature of the parts SHALL NOT exceed 140°F
(60°C). All parts remaining at 140°F (60°C) for longer than ten minutes or
exceeding 140°F (60°C) SHALL be reprocessed (cleaned and re-inspected).
The drying process SHALL be observed and checked periodically to verify the following:
a. Oven thermostat must be calibrated for accuracy and documented by the user at intervals not to exceed
180 calendar days. Calibration SHALL be accomplished per manufacturer’s instructions.
b. The oven area SHALL be inspected with a black light to ensure it is clean and without fluorescent
penetrant contamination.
c. Fans are working properly and airflow is not restricted.
d. All pooled rinse water removed.
e. Temperature setting at 140°F or less.
f. Parts remain in oven only until dry.
1.5.2.11
Developers.
1.5.2.11.1
General.
The developer process SHALL be observed and checked periodically to verify the following:
a. Area SHALL be inspected with a black light to ensure it is clean and without fluorescent penetrant
contamination. It SHALL also be free of any other contaminant which may adversely affect penetrant
inspection results (i.e., liquids, grease, excess developer, overspray, and extraneous parts and materials).
Expose to black light and visually examines for any signs of fluorescence.
b. Parts are in suitable condition (e.g., dry or wet) for the developer involved.
c. Parts receive a minimum of the required dwell time after dry (water or solvent developers).
1.5.2.11.2
Dry Powder.
1.5.2.11.2.1 General.
When dry developer is used, the process SHALL be observed and checked periodically (paragraph 1.5.5.7) to verify the
following:
a. Developer is dry with no clumping or fluorescent contamination.
b. Developer is loose, fluffy and pours easily.
