Stuff I should Know

• MHA - 6000. 200
• 6001 - 14000. 230
• 14001 and above 265

• At or below 14,000. 1 min.
• Above 14,000. 1.5 min

Time and alitude

DA is Desicion altitude in msl. The point you go missed with vertical navigation.

DH is referenced to threshold elevation.

DA is 1440. DH is 200. DA(H) 1440

• Cat I. Not less than 200ft HAT and 1800 RVR
• Cat II. Not less than 100ft HAT and 1200 RVR
• Cat IIIA. No DH and min 700 RVR
• Cat IIIB. No DH and min 150 RVR
• Cat IIIC. No DH and no RVR min

Localizer performance with vertical gidance.

• Maximum authorized altitude.
• A published altitude representing the maximum usable altitude or flight level for airspace structure or root segment.

Minimum decent altitude on non precision approach or circling approach. Cannot descend below without the required visual reference.

MDA is msl. MDH is in reference to aerodrome elevation.

• Minimum enroute altitude. The lowest published altitude between radio fixes that provides:
• *obstacle clearance requirements
• *navigational signal coverage
• *Two way communication

Little to no delay can be accepted. Not an emergency yet.

Mountainous: 2000ft above highest within 4NM

Non mountainous: 1000ft above highest within 4NM

Minimum obstruction clearance altitude.

• Minimum altitude that provides obstacle clearance
• 22nm of vor reception
• No guarantee of radar or radio
• Shown below mea on chart.

Minimum off route altitude

Route MORA - obstacle clearance 10 miles either side.

• Grid MORA - clears obstacles by 1k up to 5 k obstacles. Clears by 2 k for obstacles above 5k
• Located inside late and long grid.

• Minimum reception altitude.
• Can receive signal from nav aid

• Minimum sector altitude
• Provides 1k clearance 25nm from nav aid
• Does not garante navaid reception

3000ft in 10nm

• Minimum crossing altitude
• lowest you can cross a fix.
• Looks like flaged x

It is circled

• It is filled in.
• Only required to report when not in radar contact.

• 1 sm 2 or less engines
• 1/2 sm 3 or more engines

Q−routes are available for use by RNAV

equipped aircraft between 18,000 feet MSL and

FL 450 inclusive. Q−routes are depicted on Enroute

High Altitude Charts.

T−routes are available for use by GPS or

GPS/WAAS equipped aircraft from 1,200 feet above

the surface (or in some instances higher) up to but not

including 18,000 feet MSL. T−routes are depicted on

Enroute Low Altitude Charts.

• 1 hour before or after ETA
• 2000 ft and 3 sm

• Precision 600 ft 2 sm
• Non precision 800 ft 2 sm