Just learned that some navigation databases expire mid-flight and it almost bit me

I was digging through the AIM last week after a weird glitch in the Garmin G1000 and stumbled on this one fact: if your navigation database expires while you're in the air, the system might not warn you until you try to load an approach. I've been doing this job for about 8 years now and never thought about it because I always check databases on the ground. But my buddy out of Denver had a close call last month where his 430W database went stale right before vectors to final. He said the unit just gave a 'no valid approach' message. So now I tell all the younger guys on my crew to always check the expiration date before every flight leg, not just at preflight. Has anyone else run into a situation where database timing caught you off guard?

3 comments

3 Comments

lindal131mo ago

Oh man, this is such a real thing and I'm glad you brought it up because I had nearly the same scare about two years ago. Was flying into KAPA on a cross country trip and the database on my old Garmin 430 died somewhere over Colorado Springs. Didn't even realize it until I tried to pull up the RNAV for runway 16R and got that same blank 'no valid approach' garbage. I always thought preflight checks were enough but that experience taught me to literally set a reminder on my phone for every flight leg now. It's wild how the system just silently dies without any obvious warning light or chime to tell you. Now I always check the expiration date before I even start the engine on the second leg, especially if I've been flying the same plane for a few days in a row.

ericj4529d ago

Whoa, hold up. It's actually not the database itself that expires mid-flight - it's the subscription or the cycle that runs out. The database is still loaded on the unit, it just can't be used for approaches after that date. Otherwise you'd have a paperweight in the panel. But yeah, that no warning thing is a real pain.

elizabeths5129d ago

Yeah, that silent failure thing gets me every time. @ericj45 is right about the subscription expiring, not the database itself vanishing, but it sure feels like a trap when you're in the air and suddenly can't load an approach. I had almost the same panic last year flying into KLGB, pulled up the GPS approach and got nothing but a blank page. The unit still works for basic navigation, but it's basically useless for what you actually need it for. It's like the system just assumes you'll check the date every time, but who realistically does that on a multi-leg trip? I've started writing the expiration with a sharpie right on the panel glare shield so I can't miss it.