B757 flight crew reported receiving a low altitude alert from ATC on approach to runway 9R phl after...

Attributes
ACN	1610230
Time
Date	201901
Local Time Of Day	1201-1800
Place
Locale Reference	PHL.Airport
State Reference	PA
Environment
Flight Conditions	VMC
Aircraft 1
Make Model Name	B757-200
Operating Under FAR Part	Part 121
Flight Phase	Initial Approach
Person 1
Function	Captain Pilot Not Flying
Qualification	Flight Crew Instrument Flight Crew Air Transport Pilot (ATP) Flight Crew Multiengine
Person 2
Function	Pilot Flying First Officer
Qualification	Flight Crew Air Transport Pilot (ATP) Flight Crew Instrument Flight Crew Multiengine
Events
Anomaly	Deviation - Altitude Excursion From Assigned Altitude Deviation - Procedural Clearance Deviation - Procedural Published Material / Policy Inflight Event / Encounter CFTT / CFIT

Narrative:

We were on the PAATS3 STAR. It was not busy so ATC had us hold heading at essso to avoid the rest of the arrival and shortcut to base leg runway 9R. We had to expedite descent since we were not doing the full arrival. We used spoilers; flaps; and gear. ATC cleared us to 2;000 feet and cleared us for visual approach. The first officer armed the approach and we noticed glideslope alive from above. It captured and we continued down. I failed to notice we hadn't crossed the FAF yet [and] were descending below FAF altitude. As I noticed we were low; ATC gave us a low altitude alert and the first officer climbed back to FAF altitude (1;800 feet). The aircraft had captured a false glideslope and we didn't catch it immediately. The airplane was stable at 1;000 feet and first officer did a fine job with the rest of approach and landing.we were rushed to descend and were worried about being high not low. I should have been cross checking our position reference to our altitude. I will be cognizant of the possibility of false glideslope captures and be vigilant on monitoring altitude and position on approach.

Original NASA ASRS Text

Title: B757 flight crew reported receiving a low altitude alert from ATC on approach to Runway 9R PHL after descending on a false glideslope.

Narrative: We were on the PAATS3 STAR. It was not busy so ATC had us hold heading at ESSSO to avoid the rest of the arrival and shortcut to base leg Runway 9R. We had to expedite descent since we were not doing the full arrival. We used spoilers; flaps; and gear. ATC cleared us to 2;000 feet and cleared us for visual approach. The First Officer armed the approach and we noticed glideslope alive from above. It captured and we continued down. I failed to notice we hadn't crossed the FAF yet [and] were descending below FAF altitude. As I noticed we were low; ATC gave us a low altitude alert and the First Officer climbed back to FAF altitude (1;800 feet). The aircraft had captured a false Glideslope and we didn't catch it immediately. The airplane was stable at 1;000 feet and First Officer did a fine job with the rest of approach and landing.We were rushed to descend and were worried about being high not low. I should have been cross checking our position reference to our altitude. I will be cognizant of the possibility of false glideslope captures and be vigilant on monitoring altitude and position on approach.

Data retrieved from NASA's ASRS site and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.

B757 flight crew reported receiving a low altitude alert from ATC on approach to runway 9R phl after descending on a false glideslope.