T-1 Nav Check Basics Questions And Answers
What is the priority of weather sources? MROOF (202v3 4.10) ** Answ** MROOF
MAJCOM approved weather sources
Regional operational weather squadrons
Other DoD military weather sources
Other US government weather facilities (NWS, FAA)
Foreign civilian or military service (use only when others aren't available OCONUS)
Where can you plan to? (202v3 4.7) ** Answ** Civil airfields (on the LOA)
US military (with a PPR) and joint use fields (on the civilian side)
What is a P-field? (IFR SUP) ** Answ** A civilian airport with the permit to operate covers
use by transient military aircraft without prior approval (can do an approach, can't stop)
When can you file to a P-field? ** Answ** Emergency
Helicopter or C-Coded aircraft
Necessary for recovery of active air defense interceptor aircraft
Alternate is required and nothing else works
WG/CC or higher authority approves it and airport manager grants permission
US government tenant unit is listed for airport of intended landing and facilities can support it
MAJCOM approval (LOA)
Can I depart IFR to a destination? (202v3 4.15) ** Answ** Yes, if ETA weather at
destination (excluding TEMPO) +/- 1 hour is at or above lowest compatible approach minimums
MAJCOMs can authorize filing with weather below minimums after publishing supplemental
recovery procedures
,When do I need an alternate? (202v3 4.16) ** Answ** -Compatible instrument approaches
aren't available at destination
- Weather at destination +/- 1 hour ETA less than 2000'/3SM (INCLUDING TEMPO conditions)
- Cross winds out of limits at destination
- Required to transit through RVSM airspace to get to the airfield
How do I select an alternate? (202v3 4.16.4) ** Answ** - Alternate weather +/-1hr ETA
(INCLUDING TEMPO, except that caused by TS/rain/snow) 1000' or 500' above lowest
compatible approach minimums, and visibility is 2SM or 1SM above lowest compatible
approach minimums
- If no approach minimums are met, weather must permit descent from MEA and approach to
land using basic VFR
What disqualifies an alternate? (202v3 4.15.5) ** Answ** NWAAR
- All approaches required unmonitored NAVAIDs
- Airfield doesn't report weather observations
- "Alternate not authorized" on all compatible approaches
- Any note disqualifying the airfield in the "A IFR alternate minimums" section
- All approaches require radar
What are required fuel reserves? (202v3 4.20.3.1) ** Answ** - When alternate airport is
required, must have enough fuel for an approach and missed approach at the alternate
- Must be able to increase total planned flight time by up to 10% (45 minutes) or 20 minutes,
whichever is greater
- These rates are created with fuel consumption rates that proved best endurance at 10,000' MSL
What are fuel reserves calculated at? (202v3 4.20.3.1) ** Answ** Best endurance at 10,000'
MSL
,What are you takeoff weather minimums? (202v3 5.2) ** Answ** - Must be at or above
lowest compatible approach minimums at departing airport
- Exception: MAJCOMs may publish alternate takeoff minimums and recovery procedures when
takeoff weather is lower than published lowest compatible approach minimums
- Must always be 600 RVR or greater
When can you turn after takeoff while IFR? (202v3 5.8.1) ** Answ** - Minimum turn
altitude is 400' above DER, unless otherwise required by a published procedure or ATC
What is the minimum obstacle climb gradient? (202v3 5.8) ** Answ** Must meet or exceed
200'/NM or published climb gradient, whichever is higher
What is the minimum descent gradient that ATC can expect from you? ** Answ** 500'/NM
How can you depart IFR? (202v3 5.9) ** Answ** DDSSSIMO
-Diverse Departure
- Diverse Vetor Area (DVA)
- Specific ATC Departure Instructions
- Standard Instrument Departure (SID)
- Special Departure Procedures
- ICAO Omnidirectional Departure
- MAJCOM Certified Procedure
- Obstacle Departure Procedure (ODP)
What are the different types of ODPs? (202v3 5.9.3) ** Answ** RVSNA
- Reduced Takeoff Runway Length Procedure
- Visual Climb Over Airport (VCOA)
- Specific Routing
- Non-standard takeoff minimums
, - Any combination of the above
How is VCOA annotated? (202v3) ** Answ** - annotated textually on ODPs or as a
graphical note on an ODP
What are low close-in obstacles? (202v3 5.14) ** Answ** Obstacles that required a climb
gradient greater than 200'/NM, only until the aircraft is 1mi past departure end of the runway
Which IFR departure takes low close-in obstacles into account? (202v3) ** Answ** Diverse
departures because they determine if an obstacle penetrates the 40:1 obstacle identification
surface (40;:1 is equivalent to 152'/NM)
What are the IFR departure end crossing height restrictions for different runway designers?
(202v3 5.10.2) ** Answ** - USAF & Navy: 0' at DER
- FAA/Army: 0-35' at DER
- ICAO/NATO: 16' at DER
- Joint fields use FAA rules
What is the definition of RNAV substitute means? (202v3 4.13.13) ** Answ** Substitute
means of navigation refers to using a suitable RNAV system in lieu of an out of service
conventional NAVAIDs or non-installed or non-operable avionics.
What is the definition of RNAV alternate means? (202v3 4.13.13) ** Answ** Alternate
means refers to using a suitable RNAV system in lieu of operational conventional NAVAIDs
without monitoring those NAVAIDs.
What does OROCA guarantee? (IFR Low Chart) ** Answ** Obstacle clearance with 1000'
buffer in non-mountainous terrain areas and 2000' buffer in mountainous terrain areas in the US.
It does not provide signal coverage from NAVAIDs, ATC radar or comms coverage.
What is the priority of weather sources? MROOF (202v3 4.10) ** Answ** MROOF
MAJCOM approved weather sources
Regional operational weather squadrons
Other DoD military weather sources
Other US government weather facilities (NWS, FAA)
Foreign civilian or military service (use only when others aren't available OCONUS)
Where can you plan to? (202v3 4.7) ** Answ** Civil airfields (on the LOA)
US military (with a PPR) and joint use fields (on the civilian side)
What is a P-field? (IFR SUP) ** Answ** A civilian airport with the permit to operate covers
use by transient military aircraft without prior approval (can do an approach, can't stop)
When can you file to a P-field? ** Answ** Emergency
Helicopter or C-Coded aircraft
Necessary for recovery of active air defense interceptor aircraft
Alternate is required and nothing else works
WG/CC or higher authority approves it and airport manager grants permission
US government tenant unit is listed for airport of intended landing and facilities can support it
MAJCOM approval (LOA)
Can I depart IFR to a destination? (202v3 4.15) ** Answ** Yes, if ETA weather at
destination (excluding TEMPO) +/- 1 hour is at or above lowest compatible approach minimums
MAJCOMs can authorize filing with weather below minimums after publishing supplemental
recovery procedures
,When do I need an alternate? (202v3 4.16) ** Answ** -Compatible instrument approaches
aren't available at destination
- Weather at destination +/- 1 hour ETA less than 2000'/3SM (INCLUDING TEMPO conditions)
- Cross winds out of limits at destination
- Required to transit through RVSM airspace to get to the airfield
How do I select an alternate? (202v3 4.16.4) ** Answ** - Alternate weather +/-1hr ETA
(INCLUDING TEMPO, except that caused by TS/rain/snow) 1000' or 500' above lowest
compatible approach minimums, and visibility is 2SM or 1SM above lowest compatible
approach minimums
- If no approach minimums are met, weather must permit descent from MEA and approach to
land using basic VFR
What disqualifies an alternate? (202v3 4.15.5) ** Answ** NWAAR
- All approaches required unmonitored NAVAIDs
- Airfield doesn't report weather observations
- "Alternate not authorized" on all compatible approaches
- Any note disqualifying the airfield in the "A IFR alternate minimums" section
- All approaches require radar
What are required fuel reserves? (202v3 4.20.3.1) ** Answ** - When alternate airport is
required, must have enough fuel for an approach and missed approach at the alternate
- Must be able to increase total planned flight time by up to 10% (45 minutes) or 20 minutes,
whichever is greater
- These rates are created with fuel consumption rates that proved best endurance at 10,000' MSL
What are fuel reserves calculated at? (202v3 4.20.3.1) ** Answ** Best endurance at 10,000'
MSL
,What are you takeoff weather minimums? (202v3 5.2) ** Answ** - Must be at or above
lowest compatible approach minimums at departing airport
- Exception: MAJCOMs may publish alternate takeoff minimums and recovery procedures when
takeoff weather is lower than published lowest compatible approach minimums
- Must always be 600 RVR or greater
When can you turn after takeoff while IFR? (202v3 5.8.1) ** Answ** - Minimum turn
altitude is 400' above DER, unless otherwise required by a published procedure or ATC
What is the minimum obstacle climb gradient? (202v3 5.8) ** Answ** Must meet or exceed
200'/NM or published climb gradient, whichever is higher
What is the minimum descent gradient that ATC can expect from you? ** Answ** 500'/NM
How can you depart IFR? (202v3 5.9) ** Answ** DDSSSIMO
-Diverse Departure
- Diverse Vetor Area (DVA)
- Specific ATC Departure Instructions
- Standard Instrument Departure (SID)
- Special Departure Procedures
- ICAO Omnidirectional Departure
- MAJCOM Certified Procedure
- Obstacle Departure Procedure (ODP)
What are the different types of ODPs? (202v3 5.9.3) ** Answ** RVSNA
- Reduced Takeoff Runway Length Procedure
- Visual Climb Over Airport (VCOA)
- Specific Routing
- Non-standard takeoff minimums
, - Any combination of the above
How is VCOA annotated? (202v3) ** Answ** - annotated textually on ODPs or as a
graphical note on an ODP
What are low close-in obstacles? (202v3 5.14) ** Answ** Obstacles that required a climb
gradient greater than 200'/NM, only until the aircraft is 1mi past departure end of the runway
Which IFR departure takes low close-in obstacles into account? (202v3) ** Answ** Diverse
departures because they determine if an obstacle penetrates the 40:1 obstacle identification
surface (40;:1 is equivalent to 152'/NM)
What are the IFR departure end crossing height restrictions for different runway designers?
(202v3 5.10.2) ** Answ** - USAF & Navy: 0' at DER
- FAA/Army: 0-35' at DER
- ICAO/NATO: 16' at DER
- Joint fields use FAA rules
What is the definition of RNAV substitute means? (202v3 4.13.13) ** Answ** Substitute
means of navigation refers to using a suitable RNAV system in lieu of an out of service
conventional NAVAIDs or non-installed or non-operable avionics.
What is the definition of RNAV alternate means? (202v3 4.13.13) ** Answ** Alternate
means refers to using a suitable RNAV system in lieu of operational conventional NAVAIDs
without monitoring those NAVAIDs.
What does OROCA guarantee? (IFR Low Chart) ** Answ** Obstacle clearance with 1000'
buffer in non-mountainous terrain areas and 2000' buffer in mountainous terrain areas in the US.
It does not provide signal coverage from NAVAIDs, ATC radar or comms coverage.
