DMTA-10040-01EN, Rev. E, February 2018
Chapter 5190
5.3.1 Detecting Corrosion Using Dual Frequency to Reduce the Pillowing
Effect — NORTEC 600D Model
The procedure in this section uses dual frequency to help reduce the pillowing effect.
This reduction facilitates the detection of subsurface corrosion in aircraft fuselages.
Inspection materials are shown in Figure 5-97 on page 190.
Figure 5‑97 Materials—dual frequency for corrosion
The following products are used in this procedure:
• Surface probe: a standard reflection detachable surface probe with a diameter of -
11.2 mm (0.44 in.) and an operating range of 500 Hz to 60 kHz (equivalent to
APBK/10.5/S, SPO-2025), triaxial Fischer/LEMO connector; P/N: 9213552
SR/500Hz-60KHZ-/.44 [U8623007]
• SPO-6687 cable for reflection coil configuration probes with triaxial
Fischer/LEMO connector to NORTEC 500, 600, 1000, or 2000 series instrument (16
pin LEMO), 1.83 m (6 ft) length; P/N: SPO-6687 [U8800538]
• Special-purpose corrosion standard with pillowing inserts; P/N: RSTD-10145
[Q8600068]
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