# NTSB Safety Recommendation P-77-007

**Citation:** P-77-007  
**Type / status:** guidance / guidance  
**Agency:** National Transportation Safety Board  
**Effective:** 1977-05-26  
**Published:** 1977-05-26

INSTRUCT ITS PERSONNEL IN INSPECTION TECHNIQUES AND PROCEDURES AND EMPHASIZE THE POTENTIAL HAZARDS OF UNDETECTED FAULTY WELDS AND CONSTRUCTION DAMAGE TO OPERATING PIPELINES.

## Document text

NTSB safety recommendation P-77-007.

INSTRUCT ITS PERSONNEL IN INSPECTION TECHNIQUES AND PROCEDURES AND EMPHASIZE THE POTENTIAL HAZARDS OF UNDETECTED FAULTY WELDS AND CONSTRUCTION DAMAGE TO OPERATING PIPELINES.

Priority: CLASS II

Overall Status: Closed - Acceptable Action

Issued Date: 1977-05-26

Adopted Date: 1977-05-24

Overall Date Closed: 1978-11-21

Synopsis: ON JANUARY 25, 1977, A LOW-ORDER EXPLOSION AND FIRE DESTROYED A HOUSE IN A RESIDENTIAL AREA NEAR WILLIAMSPORT, PENNSYLVANIA; THE OCCUPANT WAS NOT SERIOUSLY INJURED BY THE EXPLOSION.

Ntsbnumber: DCA77MP011

Report Number: PAR-77-04

Addressee Name: Pennsylvania Gas and Water Company

Addressee Status: Closed--No Longer Applicable

Addressee Date Closed: 1978-11-21

Addressee Organization Type: P-Private Industry

Communication Date: 1977-12-15

Communication Type: Official Correspondence

Communication Contents: PENNSYLVANIA GAS AND WATER COMPANY LTR: WE DO HAVE A CONTINUING PROGRAM AT PENNSYLVANIA GAS AND WATER COMPANY. YOU SHOULD ALSO BE AWARE THAT THE STATE OF PENNSYLVANIA ADOPTED ACT #287 ABOUT THREE YEARS AGO TO SPECIFICALLY PREVENT EXCAVATION WORK FROM DAMAGING UNDERGROUND LINES. THIS ACT HAS GREATLY IMPROVED OUR CONTROL AND COOPERATION WITH OTHER CONSTRUCTION ACTIVITIES.

Addressee Organization Type: P-Private Industry

Communication Date: 1978-12-15

Communication Type: Official Correspondence

## Provenance

- Official: Yes
- Source: <https://data.ntsb.gov/carol-main-public/sr-details/P-77-007>
- Source ID: `ntsb-pipeline`
- SHA-256: `de1a9e019f78099b2f8e5982a1ac5a9833a700d09325102c6bdfa25bb82f3e87`
- Retrieved: 2026-08-20T04:57:24.741Z
- Exported: 2026-08-24T04:57:19.588Z
- Document slug: `ntsb-recommendation-p-77-007`

### Source metadata

```json
{
  "recordKind": "ntsb_safety_recommendation",
  "safetyRecommendationNumber": "P-77-007",
  "recommendationMode": "Pipeline",
  "topicMode": "Pipeline",
  "ntsbNumber": "DCA77MP011",
  "priority": "CLASS II",
  "overallStatus": "Closed - Acceptable Action",
  "overallStatusAcronym": "CAA",
  "overallDateClosed": "1978-11-21",
  "lastModifiedDate": "2016-11-15",
  "reportNumber": "PAR-77-04",
  "reportUrl": "https://www.ntsb.gov/investigations/Pages/DCA77MP011.aspx",
  "transmittalLetterUrl": "http://www.ntsb.gov/safety/safety-recs/recletters/P77_6_8.pdf",
  "addressees": [
    {
      "addresseeName": "Pennsylvania Gas and Water Company",
      "addresseeStatusAcronym": "CNLA",
      "addresseeStatus": "Closed--No Longer Applicable",
      "addresseeDateClosed": "1978-11-21",
      "addresseeDetails": [
        {
          "addresseeAcronym": null,
          "addresseeOrganizationType": "P-Private Industry",
          "isFromNtsb": false,
          "communicationDate": "1977-12-15",
          "communicationType": "Official Correspondence",
          "communicationContents": "PENNSYLVANIA GAS AND WATER COMPANY LTR: WE DO HAVE A CONTINUING PROGRAM AT PENNSYLVANIA GAS AND WATER COMPANY. YOU SHOULD ALSO BE AWARE THAT THE STATE OF PENNSYLVANIA ADOPTED ACT #287 ABOUT THREE YEARS AGO TO SPECIFICALLY PREVENT EXCAVATION WORK FROM DAMAGING UNDERGROUND LINES. THIS ACT HAS GREATLY IMPROVED OUR CONTROL AND COOPERATION WITH OTHER CONSTRUCTION ACTIVITIES."
        },
        {
          "addresseeAcronym": null,
          "addresseeOrganizationType": "P-Private Industry",
          "isFromNtsb": true,
          "communicationDate": "1978-12-15",
          "communicationType": "Official Correspondence",
          "communicationContents": ""
        }
      ]
    }
  ],
  "jurisdiction": "US"
}
```