According to ACR, The NADCA Standard, all portions of each coil assembly should be cleaned. In order to determine which type of cleaning is required, the ASCS should:
A. access and inspect the upstream side of the coil.
B. access and inspect the plenum upstream and downstream of the coil.
C. access and inspect both upstream and downstream surfaces of the coil.
D. perform pitot tube testing upstream and downstream of the coil.
According to ACR, The NADCA Standard, all portions of each coil assembly should be cleaned. In order to determine which
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