Yes, dump1090-fa only forwards messages with correct CRC (where there is proper CRC coverage).

Those messages have correct CRCs and the altitudes look fine; what is the abnormal data you’re referring to?

```
*8da5ad7459862675a446eea35bd0;
CRC: 000000
DF:17 AA:A5AD74 CA:5 ME:59862675A446EE
Baro altitude: 3300 ft
*8da5ad74598622d7059db72018d8;
CRC: 000000
DF:17 AA:A5AD74 CA:5 ME:598622D7059DB7
Baro altitude: 3300 ft
*8da5ad74598606757e46e1f5103d;
CRC: 000000
DF:17 AA:A5AD74 CA:5 ME:598606757E46E1
Baro altitude: 3200 ft
*8da5ad74598606753046c73c567c;
CRC: 000000
DF:17 AA:A5AD74 CA:5 ME:598606753046C7
Baro altitude: 3200 ft
*8da5ad74598606752046c21ede53;
CRC: 000000
DF:17 AA:A5AD74 CA:5 ME:598606752046C2
Baro altitude: 3200 ft
*8da5ad74592602d5c99d4ce0395d;
CRC: 000000
DF:17 AA:A5AD74 CA:5 ME:592602D5C99D4C
Baro altitude: 3000 ft
*8da5ad74592e06736846239b6ae8;
CRC: 000000
DF:17 AA:A5AD74 CA:5 ME:592E0673684623
Baro altitude: 2900 ft
*8da5ad74592e067352461a88fd56;
CRC: 000000
DF:17 AA:A5AD74 CA:5 ME:592E067352461A
Baro altitude: 2900 ft
*8da5ad74590e02d4ab9cdd1b610b;
CRC: 000000
DF:17 AA:A5AD74 CA:5 ME:590E02D4AB9CDD
Baro altitude: 2800 ft
*8da5ad74590e02d4899ccebabd6a;
CRC: 000000
DF:17 AA:A5AD74 CA:5 ME:590E02D4899CCE
Baro altitude: 2800 ft
*8da5ad74590e02d4659cbec46cb8;
CRC: 000000
DF:17 AA:A5AD74 CA:5 ME:590E02D4659CBE
Baro altitude: 2800 ft
```