# NTSB Safety Recommendation P-77-001

**Citation:** P-77-001  
**Type / status:** guidance / guidance  
**Agency:** National Transportation Safety Board  
**Effective:** 1977-06-08  
**Published:** 1977-06-08

REVISE ITS 1968 GUIDE FOR FIRE FIGHTERS AND TRAINING PROGRAM BY INCORPORATING INSTRUCTIONS ON HOW TO DEAL WITH EVENTS SIMILAR TO THIS ACCIDENT WITH PARTICULAR EMPHASIS ON THE PROPER USE OF COMBUSTIBLE GAS INDICATORS.

## Document text

NTSB safety recommendation P-77-001.

REVISE ITS 1968 GUIDE FOR FIRE FIGHTERS AND TRAINING PROGRAM BY INCORPORATING INSTRUCTIONS ON HOW TO DEAL WITH EVENTS SIMILAR TO THIS ACCIDENT WITH PARTICULAR EMPHASIS ON THE PROPER USE OF COMBUSTIBLE GAS INDICATORS.

Priority: CLASS III

Overall Status: Closed - Acceptable Action

Issued Date: 1977-06-08

Adopted Date: 1977-05-18

Overall Date Closed: 1985-07-10

Synopsis: ON AUGUST 8, 1976, A GAS EXPLOSION DESTROYED A HOUSE AT 1127 OAK STREET, ALLENTOWN, PENNSYLVANIA. THE GAS MIGRATED FROM A BREAK IN A 4-INCH CAST-IRON MAIN UNDER THE STREET, THROUGH LOOSE SOIL UNDER A CONCRETE SIDEWALK, AND INTO THE BUILDING THROUGH CRACKS AND OPENINGS IN ITS FOUNDATION.

Keywords: Training and Education

Ntsbnumber: DCA76MP024

Report Number: PAR-77-02

Addressee Name: UGI Corporation

Addressee Status: Closed - Acceptable Action

Addressee Date Closed: 1985-07-10

Addressee Organization Type: P-Private Industry

Communication Date: 1985-07-10

Communication Type: Official Correspondence

## Provenance

- Official: Yes
- Source: <https://data.ntsb.gov/carol-main-public/sr-details/P-77-001>
- Source ID: `ntsb-pipeline`
- SHA-256: `f750aeb64264667a75a0a62f8e5c355b656fe522185e791636d604c7c868b984`
- Retrieved: 2026-08-20T04:57:24.741Z
- Exported: 2026-08-23T03:26:58.432Z
- Document slug: `ntsb-recommendation-p-77-001`

### Source metadata

```json
{
  "recordKind": "ntsb_safety_recommendation",
  "safetyRecommendationNumber": "P-77-001",
  "recommendationMode": "Pipeline",
  "topicMode": "Pipeline",
  "ntsbNumber": "DCA76MP024",
  "priority": "CLASS III",
  "overallStatus": "Closed - Acceptable Action",
  "overallStatusAcronym": "CAA",
  "overallDateClosed": "1985-07-10",
  "lastModifiedDate": "2016-11-15",
  "reportNumber": "PAR-77-02",
  "reportUrl": "https://www.ntsb.gov/investigations/Pages/DCA76MP024.aspx",
  "transmittalLetterUrl": "http://www.ntsb.gov/safety/safety-recs/recletters/P77_1_3.pdf",
  "addressees": [
    {
      "addresseeName": "UGI Corporation",
      "addresseeStatusAcronym": "CAA",
      "addresseeStatus": "Closed - Acceptable Action",
      "addresseeDateClosed": "1985-07-10",
      "addresseeDetails": [
        {
          "addresseeAcronym": null,
          "addresseeOrganizationType": "P-Private Industry",
          "isFromNtsb": true,
          "communicationDate": "1985-07-10",
          "communicationType": "Official Correspondence",
          "communicationContents": ""
        }
      ]
    }
  ],
  "jurisdiction": "US"
}
```