AC 121-1A

Change 4Historical

Advisory circular · Standard Operations Specifications - Aircraft Maintenance Handbook

Approved
July 7, 1978
Last reviewed
October 25, 2024
Cancels
AC121-1A CHG 3AC120-21AC120-24A
Family
AC 121-1 · 1 version
Revision
A, change 4
14 CFR parts
1

Guidance, not mandatory unless a rule or AD requires it. DRS record last changed November 22, 2025.

Show pages 406–417
Page 418Open in PDF

pressure Edison P/N 217-08221 5,000 X Transmitter, torque pressure Edison P/N 418-04-24 2 E.O. X Indicator, ITT Insco P/N 5021-1028 5,000 X Indicator, Tachometer N1 & N2 Insco P/N 6503-1009/1015 5,000 X 78 - Exhaust Tailpipe O.C. X 79 - Engine Oil Probe - oil temp O.C. X Filter, engine oil O.C. X Insp @ 1/4 P Transmitter, oil Pressure 2 E.O. X Switch, low oil pressure O.C. X Indicator, oil pressure 5,000 X Indicator, oil temp 5,000 X Effective date _____________________ Supplement Page 11 of 11

OPERATIONS SPECIFICATIONS

AIRCRAFT MAINTENANCE -- SUPPLEMENT SNIAS N262/M-298

ATA CHAPTER OH L PF P BIP OTHER 80 - Starting

Page 419Open in PDF

Relay, starter/ Sample generator 10,000 X Insp. 1 @ 5,000 & 1 @ 7,500 Starter, generator 2 E.O. X Insp. @ 1 1/2 P 82 - Water Methanol Relay, water methanol pump O.C. X Tank, water methanol O.C. X Valve, water methanol shutoff O.C. X Indicator, water methanol qty. 5,000 X Transmitter, water methanol qty. O.C. X Transmitter, water methanol pressure O.C. X Filter, water methanol supply O.C. X Insp. @ 2 P Indicator, water methanol pressure 5,000 X Pump, water methanol boost 4,000 X Effective date ____________________