Hamilton Accies were held to a draw by 10-man Airdrie but built an eight-point cushion above second-bottom Partick Thistle in the relegation zone.
Lee Hardy followed up his own parried spot-kick on 42 minutes after Kevin Christie had nudged Mark Corcoran off the ball in the local derby.
But Christie redeemed himself when he headed in an Alan Gow corner.
Airdrie's Paul Lovering was red-carded after only 18 minutes for lashing out at Jean-Philipp Javary.
Hamilton: McEwan, Paquito, Lumsden (McPhee 62), McLaughlin, Hodge, McArthur, Javary, Mahouve, Hardy, Keogh, Corcoran (Convery 81).
Subs Not Used: Hamilton, Stevenson, Jellema.
Booked: McLaughlin, Keogh.
Goal: Hardy 42.
Airdrie Utd: McGeown, Docherty, Christie, McManus, Lovering, McKeown, Marvyn Wilson, McGowan (William Wilson 66), Hardie, Coyle (McLaren 81), Gow.
Subs Not Used: Barkey, Roberts, Hollis.
Sent Off: Lovering (18).
Goal: Christie 44.
Ref: D McDonald