Issue: Aural alerts—specifically altitude alerting and GPWS/TAWS callouts—are excessively loud.

Source: KMH 820 TAWS Audio output goes to a M1019 Summing Amp, then outputs to a junction block 1, then through a 330 Ohm Resistor, then to junction block 2, then outputs to the audio com panel (GMA-340)

There may be audio volume adjustments available from the KMH 820 if you hook up a laptop to it.

Check the KMH 820 Maintenance Manual for details.

Also check the Piper Maintenance Manual 767-005