TM 55-6930-212-10 Table 7-2.  Simulated Malfunction Details - Continued Method of Indications and effects on Effects sensed by trainee introduction related systems as presented if corrective action is Malfunction by instructor to the instructor and trainee not taken Directional gyro 327 PLT and CPLT HSI compass cards PLT and CPLT HSI com- fail rotate. Aircraft follows the pass cards rotate. direction of card rotation. PLT HSI No. 1 328 PLT HSI No. 1 pointer freezes PLT HSI No. 1 pointer Doppler pointer at last displayed bearing. freezes at last displayed bearing. PLT HSI No. 2 329 PLT HSI No. 2 pointer freezes PLT HSI No. 2 pointer VOR/ADF pointer at last displayed bearing. freezes at last displayed power fail bearing. CPLT HSI No. 1 330 CPLT No. 1 pointer oscillates Invalid Doppler station Doppler pointer ±20°  from station bearing. bearing. oscillates CPLT HSI No. 2 331 CPLT HSI No. 2 pointer oscil- Invalid VOR/ADF station VOR/ADF pointer lates ±20°  from station bearing. bearing. oscillates CPLT HSI card 332 CPLT HSI compass card precesses CPLT HSI compass card excitation loss at a rate of 15°  per hour. erratic. CPLT HSI card 333 CPLT HSI compass card oscillates CPLT HSI compass erratic. Erratic ±5°  from magnetic heading. CPLT HSI No. 1 334 CPLT HSI No. 1 pointer freezes CPLT HSI No. 1 pointer Doppler pointer at last displayed bearing. freezes at last displayed power fail bearing. CPLT HSI No. 2 335 CPLT HSI No. 2 pointer freezes CPLT HSI No. 2 pointer VOR/ADF pointer at last displayed bearing. freezes at last displayed power fail bearing. 7-9