CFI Instrument Practical Test Standards,
FAA-S-8081-9B, June 2001
II. Technical Subject Areas
C. Regulations and Publications Related to IFR Operations
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7. En Route Charts
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a. En route high altitude charts provide aeronautical information for en route instrument navigation at or above 18,000 feet MSL
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1) Established routes 18,000 feet MSL to FL 450 use NAVAIDs not more than 260 miles apart
2) Scale varies: 1 inch = 18 to 45 NM
3) Revised (NACO) every 8 weeks
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1) Provide the aeronautical information needed to effectively navigate en route from one airport to another under IFR (the IFR equivalent of the VFR sectional chart)
2) For a specific area, contain information about and depict the geographic relationships among airports, NAVAIDs, communication facilities, navigation routes, reporting points, airspace and ARTCC areas
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a) Scale varies: 1 inch = 5 to 20 NM
b) A more detailed area chart (A-1,2) is available for 12 major US traffic hubs
c) Detailed legend defines all symbols
3) Available from NACO, Distribution Division, which publishes revised editions every 56 days (8 weeks)
References:
Instrument Flying Handbook, FAA-H-8083-15, 2001
AIM Chapter 9
NACO