Supplement Type Certificate (STC) for the Installation of Current Limiting Protection and Monitoring of the Auxiliary Power Unit's Hour Meter in the Gulfstream Aerospace G-IV Aircraft. APPLICABLE REQUIREMENTS (List specific sections) 25.1301 (a) (b) (c) (d); 25.1309 (b) 1; 25.1353 (a) (b); 25.1357 (a); and 25.1431 (c) CERTIFICAT